666048631 has 4 divisors (see below), whose sum is σ = 666375112. Its totient is φ = 665722152.

The previous prime is 666048619. The next prime is 666048637. The reversal of 666048631 is 136840666.

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 666048631 - 2⁵ = 666048599 is a prime.

It is a super-2 number, since 2×666048631² = 887241557713948322, 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 (666048637) 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 3 ways as a sum of consecutive naturals, for example, 160161 + ... + 164266.

It is an arithmetic number, because the mean of its divisors is an integer number (166593778).

Almost surely, 2^666048631 is an apocalyptic number.

666048631 is a deficient number, since it is larger than the sum of its proper divisors (326481).

666048631 is a wasteful number, since it uses less digits than its factorization.

666048631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326480.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 666048631 is about 25807.9179904153. The cubic root of 666048631 is about 873.3104293309.

The spelling of 666048631 in words is "six hundred sixty-six million, forty-eight thousand, six hundred thirty-one".