68645165545 has 32 divisors (see below), whose sum is σ = 93914567424. Its totient is φ = 47679456000.

The previous prime is 68645165513. The next prime is 68645165579. The reversal of 68645165545 is 54556154686.

It is not a de Polignac number, because 68645165545 - 2⁵ = 68645165513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 784495 + ... + 867595.

It is an arithmetic number, because the mean of its divisors is an integer number (2934830232).

Almost surely, 2^68645165545 is an apocalyptic number.

It is an amenable number.

68645165545 is a deficient number, since it is larger than the sum of its proper divisors (25269401879).

68645165545 is a wasteful number, since it uses less digits than its factorization.

68645165545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83793.

The product of its digits is 17280000, while the sum is 55.

The spelling of 68645165545 in words is "sixty-eight billion, six hundred forty-five million, one hundred sixty-five thousand, five hundred forty-five".