66531311313566 has 48 divisors (see below), whose sum is σ = 109789969968000. Its totient is φ = 30215105915280.

The previous prime is 66531311313503. The next prime is 66531311313611.

66531311313566 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2985731861 + ... + 2985754143.

It is an arithmetic number, because the mean of its divisors is an integer number (2287291041000).

Almost surely, 2^{66531311313566} is an apocalyptic number.

66531311313566 is a deficient number, since it is larger than the sum of its proper divisors (43258658654434).

66531311313566 is a wasteful number, since it uses less digits than its factorization.

66531311313566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32525 (or 32514 counting only the distinct ones).

The product of its digits is 2624400, while the sum is 50.

It can be divided in two parts, 6653131 and 1313566, that added together give a palindrome (7966697).

The spelling of 66531311313566 in words is "sixty-six trillion, five hundred thirty-one billion, three hundred eleven million, three hundred thirteen thousand, five hundred sixty-six".