643251242570 has 32 divisors (see below), whose sum is σ = 1200938745600. Its totient is φ = 247772540736.

The previous prime is 643251242551. The next prime is 643251242609. The reversal of 643251242570 is 75242152346.

It is a super-2 number, since 2×643251242570² (a number of 24 digits) contains 22 as substring.

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, 2816354 + ... + 3036173.

It is an arithmetic number, because the mean of its divisors is an integer number (37529335800).

Almost surely, 2^643251242570 is an apocalyptic number.

643251242570 is a deficient number, since it is larger than the sum of its proper divisors (557687503030).

643251242570 is a wasteful number, since it uses less digits than its factorization.

643251242570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5852942.

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 643251242570 in words is "six hundred forty-three billion, two hundred fifty-one million, two hundred forty-two thousand, five hundred seventy".