645697538754 has 16 divisors (see below), whose sum is σ = 1367359494048. Its totient is φ = 202571776832.

The previous prime is 645697538749. The next prime is 645697538767. The reversal of 645697538754 is 457835796546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3165183912 + ... + 3165184115.

It is an arithmetic number, because the mean of its divisors is an integer number (85459968378).

Almost surely, 2^645697538754 is an apocalyptic number.

645697538754 is an abundant number, since it is smaller than the sum of its proper divisors (721661955294).

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

645697538754 is a wasteful number, since it uses less digits than its factorization.

645697538754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330368049.

The product of its digits is 762048000, while the sum is 69.

The spelling of 645697538754 in words is "six hundred forty-five billion, six hundred ninety-seven million, five hundred thirty-eight thousand, seven hundred fifty-four".