66557763662884 has 48 divisors (see below), whose sum is σ = 126998193394800. Its totient is φ = 30337170057216.

The previous prime is 66557763662879. The next prime is 66557763662963. The reversal of 66557763662884 is 48826636775566.

It can be written as a sum of positive squares in 8 ways, for example, as 4326491520484 + 62231272142400 = 2080022^2 + 7888680^2 .

It is a Smith number, since the sum of its digits (79) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4837417 + ... + 12510640.

It is an arithmetic number, because the mean of its divisors is an integer number (2645795695725).

Almost surely, 2^{66557763662884} is an apocalyptic number.

It is an amenable number.

66557763662884 is a deficient number, since it is larger than the sum of its proper divisors (60440429731916).

66557763662884 is a wasteful number, since it uses less digits than its factorization.

66557763662884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17348992 (or 17348990 counting only the distinct ones).

The product of its digits is 14631321600, while the sum is 79.

The spelling of 66557763662884 in words is "sixty-six trillion, five hundred fifty-seven billion, seven hundred sixty-three million, six hundred sixty-two thousand, eight hundred eighty-four".