68645321517 has 16 divisors (see below), whose sum is σ = 92397169152. Its totient is φ = 45329975040.

The previous prime is 68645321509. The next prime is 68645321567. The reversal of 68645321517 is 71512354686.

It is not a de Polignac number, because 68645321517 - 2³ = 68645321509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68645321567) 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, 5092 + ... + 370562.

It is an arithmetic number, because the mean of its divisors is an integer number (5774823072).

Almost surely, 2^68645321517 is an apocalyptic number.

It is an amenable number.

68645321517 is a deficient number, since it is larger than the sum of its proper divisors (23751847635).

68645321517 is a wasteful number, since it uses less digits than its factorization.

68645321517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366068.

The product of its digits is 1209600, while the sum is 48.

The spelling of 68645321517 in words is "sixty-eight billion, six hundred forty-five million, three hundred twenty-one thousand, five hundred seventeen".