66955702564 has 9 divisors (see below), whose sum is σ = 117173385147. Its totient is φ = 33477592524.

The previous prime is 66955702543. The next prime is 66955702577. The reversal of 66955702564 is 46520755966.

The square root of 66955702564 is 258758.

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

It is a super-2 number, since 2×66955702564² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 452827 + ... + 582205.

Almost surely, 2^66955702564 is an apocalyptic number.

66955702564 is the 258758-th square number.

It is an amenable number.

66955702564 is a deficient number, since it is larger than the sum of its proper divisors (50217682583).

66955702564 is an frugal number, since it uses more digits than its factorization.

66955702564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258762 (or 129381 counting only the distinct ones).

The product of its (nonzero) digits is 13608000, while the sum is 55.

The spelling of 66955702564 in words is "sixty-six billion, nine hundred fifty-five million, seven hundred two thousand, five hundred sixty-four".