68638011945985 has 16 divisors (see below), whose sum is σ = 83165901601536. Its totient is φ = 54376892676288.

The previous prime is 68638011945961. The next prime is 68638011945989. The reversal of 68638011945985 is 58954911083686.

It is a cyclic number.

It is not a de Polignac number, because 68638011945985 - 2¹⁹ = 68638011421697 is a prime.

It is a super-2 number, since 2×68638011945985² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68638011945989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81692092 + ... + 82528018.

It is an arithmetic number, because the mean of its divisors is an integer number (5197868850096).

Almost surely, 2^{68638011945985} is an apocalyptic number.

It is an amenable number.

68638011945985 is a deficient number, since it is larger than the sum of its proper divisors (14527889655551).

68638011945985 is a wasteful number, since it uses less digits than its factorization.

68638011945985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995472.

The product of its (nonzero) digits is 447897600, while the sum is 73.

The spelling of 68638011945985 in words is "sixty-eight trillion, six hundred thirty-eight billion, eleven million, nine hundred forty-five thousand, nine hundred eighty-five".