66420056725 has 48 divisors (see below), whose sum is σ = 92814059520. Its totient is φ = 46713240000.

The previous prime is 66420056723. The next prime is 66420056779. The reversal of 66420056725 is 52765002466.

It is not a de Polignac number, because 66420056725 - 2¹ = 66420056723 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66420056723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19938310 + ... + 19941640.

It is an arithmetic number, because the mean of its divisors is an integer number (1933626240).

Almost surely, 2^66420056725 is an apocalyptic number.

It is an amenable number.

66420056725 is a deficient number, since it is larger than the sum of its proper divisors (26394002795).

66420056725 is a wasteful number, since it uses less digits than its factorization.

66420056725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5722 (or 5717 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 66420056725 in words is "sixty-six billion, four hundred twenty million, fifty-six thousand, seven hundred twenty-five".