66442524 has 12 divisors (see below), whose sum is σ = 155032584. Its totient is φ = 22147504.

The previous prime is 66442507. The next prime is 66442559. The reversal of 66442524 is 42524466.

It is a tau number, because it is divible by the number of its divisors (12).

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, 2768427 + ... + 2768450.

It is an arithmetic number, because the mean of its divisors is an integer number (12919382).

Almost surely, 2^66442524 is an apocalyptic number.

It is an amenable number.

66442524 is an abundant number, since it is smaller than the sum of its proper divisors (88590060).

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

66442524 is a wasteful number, since it uses less digits than its factorization.

66442524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536884 (or 5536882 counting only the distinct ones).

The product of its digits is 46080, while the sum is 33.

The square root of 66442524 is about 8151.2283736870. The cubic root of 66442524 is about 405.0251958109.

It can be divided in two parts, 66442 and 524, that added together give a palindrome (66966).

The spelling of 66442524 in words is "sixty-six million, four hundred forty-two thousand, five hundred twenty-four".