66490748164 has 27 divisors (see below), whose sum is σ = 120262316391. Its totient is φ = 32165206920.

The previous prime is 66490748141. The next prime is 66490748171. The reversal of 66490748164 is 46184709466.

The square root of 66490748164 is 257858.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15985117 + ... + 15989275.

Almost surely, 2^66490748164 is an apocalyptic number.

66490748164 is the 257858-th square number.

It is an amenable number.

66490748164 is a deficient number, since it is larger than the sum of its proper divisors (53771568227).

66490748164 is an frugal number, since it uses more digits than its factorization.

66490748164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8384 (or 4192 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 55.

The spelling of 66490748164 in words is "sixty-six billion, four hundred ninety million, seven hundred forty-eight thousand, one hundred sixty-four".