68802353981 has 12 divisors (see below), whose sum is σ = 73228065300. Its totient is φ = 64630725120.

The previous prime is 68802353959. The next prime is 68802353989. The reversal of 68802353981 is 18935320886.

It can be written as a sum of positive squares in 6 ways, for example, as 123765625 + 68678588356 = 11125^2 + 262066^2 .

It is not a de Polignac number, because 68802353981 - 2³⁰ = 67728612157 is a prime.

It is a super-2 number, since 2×68802353981² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68802353989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77906 + ... + 379043.

It is an arithmetic number, because the mean of its divisors is an integer number (6102338775).

Almost surely, 2^68802353981 is an apocalyptic number.

It is an amenable number.

68802353981 is a deficient number, since it is larger than the sum of its proper divisors (4425711319).

68802353981 is a wasteful number, since it uses less digits than its factorization.

68802353981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457504 (or 457487 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 68802353981 in words is "sixty-eight billion, eight hundred two million, three hundred fifty-three thousand, nine hundred eighty-one".