66456744475 has 12 divisors (see below), whose sum is σ = 89897851080. Its totient is φ = 48332177600.

The previous prime is 66456744439. The next prime is 66456744517. The reversal of 66456744475 is 57444765466.

It is a happy number.

It is not a de Polignac number, because 66456744475 - 2¹⁵ = 66456711707 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120830170 + ... + 120830719.

It is an arithmetic number, because the mean of its divisors is an integer number (7491487590).

Almost surely, 2^66456744475 is an apocalyptic number.

66456744475 is a deficient number, since it is larger than the sum of its proper divisors (23441106605).

66456744475 is a wasteful number, since it uses less digits than its factorization.

66456744475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241660910 (or 241660905 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 58.

The spelling of 66456744475 in words is "sixty-six billion, four hundred fifty-six million, seven hundred forty-four thousand, four hundred seventy-five".