645767362878 has 16 divisors (see below), whose sum is σ = 1408946973696. Its totient is φ = 195687079640.

The previous prime is 645767362861. The next prime is 645767362957. The reversal of 645767362878 is 878263767546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4892176926 + ... + 4892177057.

It is an arithmetic number, because the mean of its divisors is an integer number (88059185856).

Almost surely, 2^645767362878 is an apocalyptic number.

645767362878 is an abundant number, since it is smaller than the sum of its proper divisors (763179610818).

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

645767362878 is a wasteful number, since it uses less digits than its factorization.

645767362878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9784353999.

The product of its digits is 568995840, while the sum is 69.

The spelling of 645767362878 in words is "six hundred forty-five billion, seven hundred sixty-seven million, three hundred sixty-two thousand, eight hundred seventy-eight".