645156614775 has 24 divisors (see below), whose sum is σ = 1066936683904. Its totient is φ = 343993932000.

The previous prime is 645156614747. The next prime is 645156614797. The reversal of 645156614775 is 577416651546.

It is not a de Polignac number, because 645156614775 - 2⁷ = 645156614647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 829501 + ... + 1406550.

Almost surely, 2^645156614775 is an apocalyptic number.

645156614775 is a deficient number, since it is larger than the sum of its proper divisors (421780069129).

645156614775 is a wasteful number, since it uses less digits than its factorization.

645156614775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239911 (or 2239906 counting only the distinct ones).

The product of its digits is 21168000, while the sum is 57.

The spelling of 645156614775 in words is "six hundred forty-five billion, one hundred fifty-six million, six hundred fourteen thousand, seven hundred seventy-five".