66256523 has 4 divisors (see below), whose sum is σ = 66346920. Its totient is φ = 66166128.

The previous prime is 66256513. The next prime is 66256543. The reversal of 66256523 is 32565266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66256523 - 2⁶ = 66256459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66256513) 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, 44090 + ... + 45567.

It is an arithmetic number, because the mean of its divisors is an integer number (16586730).

Almost surely, 2^66256523 is an apocalyptic number.

66256523 is a deficient number, since it is larger than the sum of its proper divisors (90397).

66256523 is an equidigital number, since it uses as much as digits as its factorization.

66256523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90396.

The product of its digits is 64800, while the sum is 35.

The square root of 66256523 is about 8139.8109928917. The cubic root of 66256523 is about 404.6468964187.

The spelling of 66256523 in words is "sixty-six million, two hundred fifty-six thousand, five hundred twenty-three".