66169631 has 8 divisors (see below), whose sum is σ = 72997200. Its totient is φ = 59477440.

The previous prime is 66169603. The next prime is 66169633. The reversal of 66169631 is 13696166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66169631 - 2²² = 61975327 is a prime.

It is a super-2 number, since 2×66169631² = 8756840133352322, which 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 (66169633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32816 + ... + 34773.

It is an arithmetic number, because the mean of its divisors is an integer number (9124650).

Almost surely, 2^66169631 is an apocalyptic number.

66169631 is a deficient number, since it is larger than the sum of its proper divisors (6827569).

66169631 is a wasteful number, since it uses less digits than its factorization.

66169631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67689.

The product of its digits is 34992, while the sum is 38.

The square root of 66169631 is about 8134.4717714182. The cubic root of 66169631 is about 404.4699278820.

The spelling of 66169631 in words is "sixty-six million, one hundred sixty-nine thousand, six hundred thirty-one".