645216374090 has 32 divisors (see below), whose sum is σ = 1220730600960. Its totient is φ = 245063446144.

The previous prime is 645216374057. The next prime is 645216374129. The reversal of 645216374090 is 90473612546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10206770 + ... + 10269789.

It is an arithmetic number, because the mean of its divisors is an integer number (38147831280).

Almost surely, 2^645216374090 is an apocalyptic number.

645216374090 is a deficient number, since it is larger than the sum of its proper divisors (575514226870).

645216374090 is a wasteful number, since it uses less digits than its factorization.

645216374090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20476726.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 645216374090 in words is "six hundred forty-five billion, two hundred sixteen million, three hundred seventy-four thousand, ninety".