645717717546 has 32 divisors (see below), whose sum is σ = 1432717286400. Its totient is φ = 192355559280.

The previous prime is 645717717529. The next prime is 645717717563.

645717717546 is nontrivially palindromic in base 10.

645717717546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645717717529) and next prime (645717717563).

It is a self number, because there is not a number n which added to its sum of digits gives 645717717546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82907986 + ... + 82915773.

It is an arithmetic number, because the mean of its divisors is an integer number (44772415200).

Almost surely, 2^645717717546 is an apocalyptic number.

645717717546 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

645717717546 is an abundant number, since it is smaller than the sum of its proper divisors (786999568854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645717717546 is a wasteful number, since it uses less digits than its factorization.

645717717546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165823834.

The product of its digits is 34574400, while the sum is 60.

The spelling of 645717717546 in words is "six hundred forty-five billion, seven hundred seventeen million, seven hundred seventeen thousand, five hundred forty-six".