669417631 has 4 divisors (see below), whose sum is σ = 670227912. Its totient is φ = 668607352.

The previous prime is 669417601. The next prime is 669417641. The reversal of 669417631 is 136714966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136714966 = 2 ⋅68357483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669417631 is a prime.

It is a super-2 number, since 2×669417631² = 896239929387304322, 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 (669417601) 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, 403900 + ... + 405553.

It is an arithmetic number, because the mean of its divisors is an integer number (167556978).

Almost surely, 2^669417631 is an apocalyptic number.

669417631 is a deficient number, since it is larger than the sum of its proper divisors (810281).

669417631 is an equidigital number, since it uses as much as digits as its factorization.

669417631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810280.

The product of its digits is 163296, while the sum is 43.

The square root of 669417631 is about 25873.1063268406. The cubic root of 669417631 is about 874.7804100936.

The spelling of 669417631 in words is "six hundred sixty-nine million, four hundred seventeen thousand, six hundred thirty-one".