66759699870874 has 16 divisors (see below), whose sum is σ = 100202675718600. Its totient is φ = 33358808762944.

The previous prime is 66759699870863. The next prime is 66759699870907. The reversal of 66759699870874 is 47807899695766.

It can be written as a sum of positive squares in 4 ways, for example, as 56179597043025 + 10580102827849 = 7495305^2 + 3252707^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197937972 + ... + 198274960.

Almost surely, 2^{66759699870874} is an apocalyptic number.

66759699870874 is a deficient number, since it is larger than the sum of its proper divisors (33442975847726).

66759699870874 is a wasteful number, since it uses less digits than its factorization.

66759699870874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399137.

The product of its (nonzero) digits is 69132994560, while the sum is 91.

The spelling of 66759699870874 in words is "sixty-six trillion, seven hundred fifty-nine billion, six hundred ninety-nine million, eight hundred seventy thousand, eight hundred seventy-four".