643451166564 has 48 divisors (see below), whose sum is σ = 1549926228480. Its totient is φ = 207550379520.

The previous prime is 643451166563. The next prime is 643451166583. The reversal of 643451166564 is 465661154346.

It is not an unprimeable number, because it can be changed into a prime (643451166563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6112972 + ... + 6217340.

It is an arithmetic number, because the mean of its divisors is an integer number (32290129760).

Almost surely, 2^643451166564 is an apocalyptic number.

It is an amenable number.

643451166564 is an abundant number, since it is smaller than the sum of its proper divisors (906475061916).

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

643451166564 is a wasteful number, since it uses less digits than its factorization.

643451166564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120980 (or 120978 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 51.

The spelling of 643451166564 in words is "six hundred forty-three billion, four hundred fifty-one million, one hundred sixty-six thousand, five hundred sixty-four".