66696880 has 20 divisors (see below), whose sum is σ = 155070432. Its totient is φ = 26678720.

The previous prime is 66696869. The next prime is 66696893. The reversal of 66696880 is 8869666.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416776 + ... + 416935.

Almost surely, 2^66696880 is an apocalyptic number.

It is an amenable number.

66696880 is an abundant number, since it is smaller than the sum of its proper divisors (88373552).

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

66696880 is a wasteful number, since it uses less digits than its factorization.

66696880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833724 (or 833718 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 66696880 is about 8166.8157809516. The cubic root of 66696880 is about 405.5413783191.

It can be divided in two parts, 66696 and 880, that added together give a palindrome (67576).

The spelling of 66696880 in words is "sixty-six million, six hundred ninety-six thousand, eight hundred eighty".