66213552 has 20 divisors (see below), whose sum is σ = 171051800. Its totient is φ = 22071168.

The previous prime is 66213541. The next prime is 66213569. The reversal of 66213552 is 25531266.

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, 689677 + ... + 689772.

It is an arithmetic number, because the mean of its divisors is an integer number (8552590).

Almost surely, 2^66213552 is an apocalyptic number.

It is an amenable number.

66213552 is an abundant number, since it is smaller than the sum of its proper divisors (104838248).

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

66213552 is a wasteful number, since it uses less digits than its factorization.

66213552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379460 (or 1379454 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 66213552 is about 8137.1710071744. The cubic root of 66213552 is about 404.5593989095.

The spelling of 66213552 in words is "sixty-six million, two hundred thirteen thousand, five hundred fifty-two".