645621260334 has 32 divisors (see below), whose sum is σ = 1313217360000. Its totient is φ = 211545110304.

The previous prime is 645621260321. The next prime is 645621260377. The reversal of 645621260334 is 433062126546.

It is a happy number.

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, 5974717 + ... + 6081815.

It is an arithmetic number, because the mean of its divisors is an integer number (41038042500).

Almost surely, 2^645621260334 is an apocalyptic number.

645621260334 is an abundant number, since it is smaller than the sum of its proper divisors (667596099666).

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

645621260334 is a wasteful number, since it uses less digits than its factorization.

645621260334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124192.

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 645621260334 in words is "six hundred forty-five billion, six hundred twenty-one million, two hundred sixty thousand, three hundred thirty-four".