66516056601506 has 8 divisors (see below), whose sum is σ = 99774128977644. Its totient is φ = 33258013608960.

The previous prime is 66516056601487. The next prime is 66516056601557. The reversal of 66516056601506 is 60510665061566.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66324817440025 + 191239161481 = 8144005^2 + 437309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 356615 + ... + 11539466.

Almost surely, 2^{66516056601506} is an apocalyptic number.

66516056601506 is a deficient number, since it is larger than the sum of its proper divisors (33258072376138).

66516056601506 is a wasteful number, since it uses less digits than its factorization.

66516056601506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14691796.

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 66516056601506 in words is "sixty-six trillion, five hundred sixteen billion, fifty-six million, six hundred one thousand, five hundred six".