66531167995 has 16 divisors (see below), whose sum is σ = 81736012512. Its totient is φ = 51960464640.

The previous prime is 66531167987. The next prime is 66531168007. The reversal of 66531167995 is 59976113566.

It is not a de Polignac number, because 66531167995 - 2³ = 66531167987 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345775 + ... + 502615.

It is an arithmetic number, because the mean of its divisors is an integer number (5108500782).

Almost surely, 2^66531167995 is an apocalyptic number.

66531167995 is a deficient number, since it is larger than the sum of its proper divisors (15204844517).

66531167995 is a wasteful number, since it uses less digits than its factorization.

66531167995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158862.

The product of its digits is 9185400, while the sum is 58.

The spelling of 66531167995 in words is "sixty-six billion, five hundred thirty-one million, one hundred sixty-seven thousand, nine hundred ninety-five".