66642066225023 has 4 divisors (see below), whose sum is σ = 66712886700168. Its totient is φ = 66571245749880.

The previous prime is 66642066224989. The next prime is 66642066225043. The reversal of 66642066225023 is 32052266024666.

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 66642066225023 - 2¹² = 66642066220927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66642066225043) 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, 35410236161 + ... + 35410238042.

It is an arithmetic number, because the mean of its divisors is an integer number (16678221675042).

Almost surely, 2^{66642066225023} is an apocalyptic number.

66642066225023 is a deficient number, since it is larger than the sum of its proper divisors (70820475145).

66642066225023 is an equidigital number, since it uses as much as digits as its factorization.

66642066225023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70820475144.

The product of its (nonzero) digits is 7464960, while the sum is 50.

The spelling of 66642066225023 in words is "sixty-six trillion, six hundred forty-two billion, sixty-six million, two hundred twenty-five thousand, twenty-three".