66264512245561 has 32 divisors (see below), whose sum is σ = 83688380610048. Its totient is φ = 51122829542400.

The previous prime is 66264512245553. The next prime is 66264512245571. The reversal of 66264512245561 is 16554221546266.

It is not a de Polignac number, because 66264512245561 - 2³ = 66264512245553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66264512245501) 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, 11588311 + ... + 16334563.

It is an arithmetic number, because the mean of its divisors is an integer number (2615261894064).

Almost surely, 2^{66264512245561} is an apocalyptic number.

It is an amenable number.

66264512245561 is a deficient number, since it is larger than the sum of its proper divisors (17423868364487).

66264512245561 is a wasteful number, since it uses less digits than its factorization.

66264512245561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751401.

The product of its digits is 20736000, while the sum is 55.

The spelling of 66264512245561 in words is "sixty-six trillion, two hundred sixty-four billion, five hundred twelve million, two hundred forty-five thousand, five hundred sixty-one".