66948565776 has 40 divisors (see below), whose sum is σ = 183124020384. Its totient is φ = 21003471360.

The previous prime is 66948565763. The next prime is 66948565777. The reversal of 66948565776 is 67756584966.

It is a super-2 number, since 2×66948565776² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66948565776.

It is not an unprimeable number, because it can be changed into a prime (66948565777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41021590 + ... + 41023221.

Almost surely, 2^66948565776 is an apocalyptic number.

It is an amenable number.

66948565776 is an abundant number, since it is smaller than the sum of its proper divisors (116175454608).

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

66948565776 is a wasteful number, since it uses less digits than its factorization.

66948565776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82044839 (or 82044833 counting only the distinct ones).

The product of its digits is 457228800, while the sum is 69.

The spelling of 66948565776 in words is "sixty-six billion, nine hundred forty-eight million, five hundred sixty-five thousand, seven hundred seventy-six".