66566440375 has 8 divisors (see below), whose sum is σ = 83074917744. Its totient is φ = 53253152200.

The previous prime is 66566440373. The next prime is 66566440433. The reversal of 66566440375 is 57304466566.

It is not a de Polignac number, because 66566440375 - 2¹ = 66566440373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566440373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266265637 + ... + 266265886.

It is an arithmetic number, because the mean of its divisors is an integer number (10384364718).

Almost surely, 2^66566440375 is an apocalyptic number.

66566440375 is a deficient number, since it is larger than the sum of its proper divisors (16508477369).

66566440375 is an equidigital number, since it uses as much as digits as its factorization.

66566440375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532531538 (or 532531528 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 52.

The spelling of 66566440375 in words is "sixty-six billion, five hundred sixty-six million, four hundred forty thousand, three hundred seventy-five".