642666524 has 12 divisors (see below), whose sum is σ = 1125038544. Its totient is φ = 321226944.

The previous prime is 642666517. The next prime is 642666533. The reversal of 642666524 is 425666246.

It is a super-2 number, since 2×642666524² = 826040522140485152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12104 + ... + 37839.

It is an arithmetic number, because the mean of its divisors is an integer number (93753212).

Almost surely, 2^642666524 is an apocalyptic number.

It is an amenable number.

642666524 is a deficient number, since it is larger than the sum of its proper divisors (482372020).

642666524 is a wasteful number, since it uses less digits than its factorization.

642666524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53164 (or 53162 counting only the distinct ones).

The product of its digits is 414720, while the sum is 41.

The square root of 642666524 is about 25350.8683086004. The cubic root of 642666524 is about 862.9690617815.

The spelling of 642666524 in words is "six hundred forty-two million, six hundred sixty-six thousand, five hundred twenty-four".