66511575561712 has 20 divisors (see below), whose sum is σ = 128924673487480. Its totient is φ = 33240692081088.

The previous prime is 66511575561679. The next prime is 66511575561751. The reversal of 66511575561712 is 21716557511566.

It is a congruent number.

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, 943444887 + ... + 943515382.

It is an arithmetic number, because the mean of its divisors is an integer number (6446233674374).

Almost surely, 2^{66511575561712} is an apocalyptic number.

It is an amenable number.

66511575561712 is a deficient number, since it is larger than the sum of its proper divisors (62413097925768).

66511575561712 is a wasteful number, since it uses less digits than its factorization.

66511575561712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886962480 (or 1886962474 counting only the distinct ones).

The product of its digits is 13230000, while the sum is 58.

The spelling of 66511575561712 in words is "sixty-six trillion, five hundred eleven billion, five hundred seventy-five million, five hundred sixty-one thousand, seven hundred twelve".