645548777995 has 16 divisors (see below), whose sum is σ = 845359423200. Its totient is φ = 469335916800.

The previous prime is 645548777989. The next prime is 645548778053. The reversal of 645548777995 is 599777845546.

It is not a de Polignac number, because 645548777995 - 2⁵ = 645548777963 is a prime.

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, 1757076 + ... + 2092465.

It is an arithmetic number, because the mean of its divisors is an integer number (52834963950).

Almost surely, 2^645548777995 is an apocalyptic number.

645548777995 is a deficient number, since it is larger than the sum of its proper divisors (199810645205).

645548777995 is a wasteful number, since it uses less digits than its factorization.

645548777995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852606.

The product of its digits is 2667168000, while the sum is 76.

The spelling of 645548777995 in words is "six hundred forty-five billion, five hundred forty-eight million, seven hundred seventy-seven thousand, nine hundred ninety-five".