66740747475 has 12 divisors (see below), whose sum is σ = 110344702616. Its totient is φ = 35595065280.

The previous prime is 66740747443. The next prime is 66740747477. The reversal of 66740747475 is 57474704766.

It is not a de Polignac number, because 66740747475 - 2⁵ = 66740747443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66740747477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444938242 + ... + 444938391.

Almost surely, 2^66740747475 is an apocalyptic number.

66740747475 is a deficient number, since it is larger than the sum of its proper divisors (43603955141).

66740747475 is a wasteful number, since it uses less digits than its factorization.

66740747475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889876646 (or 889876641 counting only the distinct ones).

The product of its (nonzero) digits is 27659520, while the sum is 57.

The spelling of 66740747475 in words is "sixty-six billion, seven hundred forty million, seven hundred forty-seven thousand, four hundred seventy-five".