66954667536 has 45 divisors (see below), whose sum is σ = 187388766799. Its totient is φ = 22317187488.

The previous prime is 66954667469. The next prime is 66954667547. The reversal of 66954667536 is 63576645966.

The square root of 66954667536 is 258756.

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

66954667536 is a `hidden beast` number, since 6 + 6 + 95 + 4 + 6 + 6 + 7 + 536 = 666.

66954667536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66954667536² (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 8 ways as a sum of consecutive naturals, for example, 3094291 + ... + 3115853.

Almost surely, 2^66954667536 is an apocalyptic number.

66954667536 is the 258756-th square number.

It is an amenable number.

66954667536 is an abundant number, since it is smaller than the sum of its proper divisors (120434099263).

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

66954667536 is an frugal number, since it uses more digits than its factorization.

66954667536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43140 (or 21568 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 63.

The spelling of 66954667536 in words is "sixty-six billion, nine hundred fifty-four million, six hundred sixty-seven thousand, five hundred thirty-six".