68638466457 has 12 divisors (see below), whose sum is σ = 108157583664. Its totient is φ = 41599070520.

The previous prime is 68638466453. The next prime is 68638466461. The reversal of 68638466457 is 75466483686.

68638466457 is a `hidden beast` number, since 68 + 63 + 8 + 4 + 66 + 457 = 666.

It is an interprime number because it is at equal distance from previous prime (68638466453) and next prime (68638466461).

It is not a de Polignac number, because 68638466457 - 2² = 68638466453 is a prime.

It is a super-2 number, since 2×68638466457² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68638466394 and 68638466403.

It is not an unprimeable number, because it can be changed into a prime (68638466453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346658823 + ... + 346659020.

It is an arithmetic number, because the mean of its divisors is an integer number (9013131972).

Almost surely, 2^68638466457 is an apocalyptic number.

It is an amenable number.

68638466457 is a deficient number, since it is larger than the sum of its proper divisors (39519117207).

68638466457 is a wasteful number, since it uses less digits than its factorization.

68638466457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693317860 (or 693317857 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 63.

It can be divided in two parts, 68638 and 466457, that added together give a triangular number (535095 = T₁₀₃₄).

The spelling of 68638466457 in words is "sixty-eight billion, six hundred thirty-eight million, four hundred sixty-six thousand, four hundred fifty-seven".