66572623663 has 32 divisors (see below), whose sum is σ = 84518456960. Its totient is φ = 51024867840.

The previous prime is 66572623661. The next prime is 66572623687. The reversal of 66572623663 is 36632627566.

It is a happy number.

66572623663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66572623663 - 2¹ = 66572623661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66572623663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66572623661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727873 + ... + 814213.

It is an arithmetic number, because the mean of its divisors is an integer number (2641201780).

Almost surely, 2^66572623663 is an apocalyptic number.

66572623663 is a deficient number, since it is larger than the sum of its proper divisors (17945833297).

66572623663 is a wasteful number, since it uses less digits than its factorization.

66572623663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86627.

The product of its digits is 9797760, while the sum is 52.

The spelling of 66572623663 in words is "sixty-six billion, five hundred seventy-two million, six hundred twenty-three thousand, six hundred sixty-three".