66579736856 has 32 divisors (see below), whose sum is σ = 127133269200. Its totient is φ = 32679680640.

The previous prime is 66579736831. The next prime is 66579736879. The reversal of 66579736856 is 65863797566.

It is a happy number.

It is a super-2 number, since 2×66579736856² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 114371 + ... + 382413.

Almost surely, 2^66579736856 is an apocalyptic number.

It is an amenable number.

66579736856 is a deficient number, since it is larger than the sum of its proper divisors (60553532344).

66579736856 is a wasteful number, since it uses less digits than its factorization.

66579736856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268619 (or 268615 counting only the distinct ones).

The product of its digits is 342921600, while the sum is 68.

The spelling of 66579736856 in words is "sixty-six billion, five hundred seventy-nine million, seven hundred thirty-six thousand, eight hundred fifty-six".