645244633560 has 128 divisors (see below), whose sum is σ = 2049838202880. Its totient is φ = 161924978688.

The previous prime is 645244633541. The next prime is 645244633591. The reversal of 645244633560 is 65336442546.

645244633560 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28309929 + ... + 28332711.

It is an arithmetic number, because the mean of its divisors is an integer number (16014360960).

Almost surely, 2^645244633560 is an apocalyptic number.

645244633560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645244633560 is an abundant number, since it is smaller than the sum of its proper divisors (1404593569320).

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

645244633560 is a wasteful number, since it uses less digits than its factorization.

645244633560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36697 (or 36693 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 48.

The spelling of 645244633560 in words is "six hundred forty-five billion, two hundred forty-four million, six hundred thirty-three thousand, five hundred sixty".