645022763870 has 32 divisors (see below), whose sum is σ = 1180340614080. Its totient is φ = 253722205440.

The previous prime is 645022763863. The next prime is 645022763951. The reversal of 645022763870 is 78367220546.

It is a congruent number.

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, 2639594 + ... + 2873586.

It is an arithmetic number, because the mean of its divisors is an integer number (36885644190).

Almost surely, 2^645022763870 is an apocalyptic number.

645022763870 is a deficient number, since it is larger than the sum of its proper divisors (535317850210).

645022763870 is a wasteful number, since it uses less digits than its factorization.

645022763870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238580.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 645022763870 in words is "six hundred forty-five billion, twenty-two million, seven hundred sixty-three thousand, eight hundred seventy".