645371416980 has 72 divisors (see below), whose sum is σ = 1957813288704. Its totient is φ = 172082635200.

The previous prime is 645371416967. The next prime is 645371417011. The reversal of 645371416980 is 89614173546.

645371416980 is a `hidden beast` number, since 6 + 4 + 537 + 1 + 4 + 16 + 98 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1784065 + ... + 2115095.

It is an arithmetic number, because the mean of its divisors is an integer number (27191851232).

Almost surely, 2^645371416980 is an apocalyptic number.

645371416980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645371416980 is an abundant number, since it is smaller than the sum of its proper divisors (1312441871724).

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

645371416980 is a wasteful number, since it uses less digits than its factorization.

645371416980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341877 (or 341872 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 645371416980 in words is "six hundred forty-five billion, three hundred seventy-one million, four hundred sixteen thousand, nine hundred eighty".