66371561516 has 48 divisors (see below), whose sum is σ = 125703496128. Its totient is φ = 30481920000.

The previous prime is 66371561497. The next prime is 66371561521. The reversal of 66371561516 is 61516517366.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9025241 + ... + 9032591.

It is an arithmetic number, because the mean of its divisors is an integer number (2618822836).

Almost surely, 2^66371561516 is an apocalyptic number.

It is an amenable number.

66371561516 is a deficient number, since it is larger than the sum of its proper divisors (59331934612).

66371561516 is a wasteful number, since it uses less digits than its factorization.

66371561516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8202 (or 8200 counting only the distinct ones).

The product of its digits is 680400, while the sum is 47.

The spelling of 66371561516 in words is "sixty-six billion, three hundred seventy-one million, five hundred sixty-one thousand, five hundred sixteen".