4978911681 has 6 divisors (see below), whose sum is σ = 7191761330. Its totient is φ = 3319274448.

The previous prime is 4978911667. The next prime is 4978911689. The reversal of 4978911681 is 1861198794.

4978911681 is a `hidden beast` number, since 497 + 8 + 91 + 1 + 68 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4527136656 + 451775025 = 67284^2 + 21255^2 .

It is not a de Polignac number, because 4978911681 - 2⁶ = 4978911617 is a prime.

It is a super-2 number, since 2×4978911681² = 49579123054396491522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4978911689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 276606196 + ... + 276606213.

Almost surely, 2^4978911681 is an apocalyptic number.

It is an amenable number.

4978911681 is a deficient number, since it is larger than the sum of its proper divisors (2212849649).

4978911681 is a wasteful number, since it uses less digits than its factorization.

4978911681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553212415 (or 553212412 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 4978911681 is about 70561.4036212432. The cubic root of 4978911681 is about 1707.5685243821.

The spelling of 4978911681 in words is "four billion, nine hundred seventy-eight million, nine hundred eleven thousand, six hundred eighty-one".