66704631 has 24 divisors (see below), whose sum is σ = 103968000. Its totient is φ = 37930032.

The previous prime is 66704629. The next prime is 66704641. The reversal of 66704631 is 13640766.

It is not a de Polignac number, because 66704631 - 2¹ = 66704629 is a prime.

It is a super-2 number, since 2×66704631² = 8899015593692322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66704592 and 66704601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66704641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32370 + ... + 34368.

It is an arithmetic number, because the mean of its divisors is an integer number (4332000).

Almost surely, 2^66704631 is an apocalyptic number.

66704631 is a deficient number, since it is larger than the sum of its proper divisors (37263369).

66704631 is a wasteful number, since it uses less digits than its factorization.

66704631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243 (or 2236 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 66704631 is about 8167.2903095213. The cubic root of 66704631 is about 405.5570873471.

The spelling of 66704631 in words is "sixty-six million, seven hundred four thousand, six hundred thirty-one".