66154564 has 24 divisors (see below), whose sum is σ = 132850368. Its totient is φ = 28236000.

The previous prime is 66154559. The next prime is 66154573. The reversal of 66154564 is 46545166.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2322 + ... + 11734.

It is an arithmetic number, because the mean of its divisors is an integer number (5535432).

Almost surely, 2^66154564 is an apocalyptic number.

It is an amenable number.

66154564 is an abundant number, since it is smaller than the sum of its proper divisors (66695804).

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

66154564 is a wasteful number, since it uses less digits than its factorization.

66154564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9675 (or 9673 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 66154564 is about 8133.5455983230. The cubic root of 66154564 is about 404.4392259275.

It can be divided in two parts, 661 and 54564, that added together give a square (55225 = 235²).

The spelling of 66154564 in words is "sixty-six million, one hundred fifty-four thousand, five hundred sixty-four".