66026220752657 has 4 divisors (see below), whose sum is σ = 72028604457456. Its totient is φ = 60023837047860.

The previous prime is 66026220752593. The next prime is 66026220752669. The reversal of 66026220752657 is 75625702262066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66026220752657 - 2⁶ = 66026220752593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66026220755657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3001191852383 + ... + 3001191852404.

It is an arithmetic number, because the mean of its divisors is an integer number (18007151114364).

Almost surely, 2^{66026220752657} is an apocalyptic number.

It is an amenable number.

66026220752657 is a deficient number, since it is larger than the sum of its proper divisors (6002383704799).

66026220752657 is a wasteful number, since it uses less digits than its factorization.

66026220752657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6002383704798.

The product of its (nonzero) digits is 25401600, while the sum is 56.

The spelling of 66026220752657 in words is "sixty-six trillion, twenty-six billion, two hundred twenty million, seven hundred fifty-two thousand, six hundred fifty-seven".