66903968690 has 128 divisors (see below), whose sum is σ = 148457111040. Its totient is φ = 21430407168.

The previous prime is 66903968617. The next prime is 66903968701. The reversal of 66903968690 is 9686930966.

It is a super-2 number, since 2×66903968690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1532099 + ... + 1575161.

It is an arithmetic number, because the mean of its divisors is an integer number (1159821180).

Almost surely, 2^66903968690 is an apocalyptic number.

66903968690 is an abundant number, since it is smaller than the sum of its proper divisors (81553142350).

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

66903968690 is a wasteful number, since it uses less digits than its factorization.

66903968690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43156.

The product of its (nonzero) digits is 22674816, while the sum is 62.

The spelling of 66903968690 in words is "sixty-six billion, nine hundred three million, nine hundred sixty-eight thousand, six hundred ninety".