4939688496681 has 45 divisors (see below), whose sum is σ = 7555952950029. Its totient is φ = 3215981266344.

The previous prime is 4939688496667. The next prime is 4939688496713. The reversal of 4939688496681 is 1866948869394.

The square root of 4939688496681 is 2222541.

It is a perfect power (a square), and thus also a powerful number.

4939688496681 is a `hidden beast` number, since 4 + 9 + 3 + 9 + 68 + 8 + 496 + 68 + 1 = 666.

It is not a de Polignac number, because 4939688496681 - 2²⁵ = 4939654942249 is a prime.

It is a super-2 number, since 2×4939688496681² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 4939688496681.

It is not an unprimeable number, because it can be changed into a prime (4939688496661) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 860120496 + ... + 860126238.

Almost surely, 2^{4939688496681} is an apocalyptic number.

4939688496681 is the 2222541-st square number.

4939688496681 is the 1111271-st centered octagonal number.

It is an amenable number.

4939688496681 is a deficient number, since it is larger than the sum of its proper divisors (2616264453348).

4939688496681 is an frugal number, since it uses more digits than its factorization.

4939688496681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11584 (or 5789 counting only the distinct ones).

The product of its digits is 3869835264, while the sum is 81.

Multiplying 4939688496681 by its sum of digits (81), we get a square (400114768231161 = 20002869²).

4939688496681 divided by its sum of digits (81) gives a square (60983808601 = 246949²).

The spelling of 4939688496681 in words is "four trillion, nine hundred thirty-nine billion, six hundred eighty-eight million, four hundred ninety-six thousand, six hundred eighty-one".