669618131 has 16 divisors (see below), whose sum is σ = 824807424. Its totient is φ = 529382304.

The previous prime is 669618029. The next prime is 669618133. The reversal of 669618131 is 131816966.

It is a cyclic number.

It is not a de Polignac number, because 669618131 - 2¹⁴ = 669601747 is a prime.

It is a super-2 number, since 2×669618131² = 896776882727866322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (669618133) 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 15 ways as a sum of consecutive naturals, for example, 160190 + ... + 164316.

It is an arithmetic number, because the mean of its divisors is an integer number (51550464).

Almost surely, 2^669618131 is an apocalyptic number.

669618131 is a deficient number, since it is larger than the sum of its proper divisors (155189293).

669618131 is a wasteful number, since it uses less digits than its factorization.

669618131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5930.

The product of its digits is 46656, while the sum is 41.

The square root of 669618131 is about 25876.9807164592. The cubic root of 669618131 is about 874.8677377229.

The spelling of 669618131 in words is "six hundred sixty-nine million, six hundred eighteen thousand, one hundred thirty-one".