645216632520240 has 160 divisors (see below), whose sum is σ = 2182229888919552. Its totient is φ = 156400056576000.

The previous prime is 645216632520223. The next prime is 645216632520311. The reversal of 645216632520240 is 42025236612546.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 645216632520240.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13092705 + ... + 38234175.

Almost surely, 2^{645216632520240} is an apocalyptic number.

645216632520240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645216632520240 is an abundant number, since it is smaller than the sum of its proper divisors (1537013256399312).

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

645216632520240 is a wasteful number, since it uses less digits than its factorization.

645216632520240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25151219 (or 25151213 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 645216632520240 in words is "six hundred forty-five trillion, two hundred sixteen billion, six hundred thirty-two million, five hundred twenty thousand, two hundred forty".