66162356431 has 4 divisors (see below), whose sum is σ = 66583772872. Its totient is φ = 65740939992.

The previous prime is 66162356413. The next prime is 66162356459. The reversal of 66162356431 is 13465326166.

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 66162356431 - 2⁵ = 66162356399 is a prime.

It is a super-2 number, since 2×66162356431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66162356411) 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, 210707985 + ... + 210708298.

It is an arithmetic number, because the mean of its divisors is an integer number (16645943218).

Almost surely, 2^66162356431 is an apocalyptic number.

66162356431 is a deficient number, since it is larger than the sum of its proper divisors (421416441).

66162356431 is a wasteful number, since it uses less digits than its factorization.

66162356431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421416440.

The product of its digits is 466560, while the sum is 43.

The spelling of 66162356431 in words is "sixty-six billion, one hundred sixty-two million, three hundred fifty-six thousand, four hundred thirty-one".