66774631 has 8 divisors (see below), whose sum is σ = 83251584. Its totient is φ = 52032120.

The previous prime is 66774629. The next prime is 66774661. The reversal of 66774631 is 13647766.

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

It is not a de Polignac number, because 66774631 - 2¹ = 66774629 is a prime.

It is a super-2 number, since 2×66774631² = 8917702690372322, 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 (66774601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433525 + ... + 433678.

It is an arithmetic number, because the mean of its divisors is an integer number (10406448).

Almost surely, 2^66774631 is an apocalyptic number.

66774631 is a deficient number, since it is larger than the sum of its proper divisors (16476953).

66774631 is a wasteful number, since it uses less digits than its factorization.

66774631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867221.

The product of its digits is 127008, while the sum is 40.

The square root of 66774631 is about 8171.5745728715. The cubic root of 66774631 is about 405.6989019457.

The spelling of 66774631 in words is "sixty-six million, seven hundred seventy-four thousand, six hundred thirty-one".