1660664631 has 8 divisors (see below), whose sum is σ = 2214411264. Its totient is φ = 1107013880.

The previous prime is 1660664627. The next prime is 1660664639. The reversal of 1660664631 is 1364660661.

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

It is a cyclic number.

It is not a de Polignac number, because 1660664631 - 2² = 1660664627 is a prime.

It is a super-2 number, since 2×1660664631² = 5515614033308732322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1660664631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660664639) 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, 43900 + ... + 72446.

It is an arithmetic number, because the mean of its divisors is an integer number (276801408).

Almost surely, 2^1660664631 is an apocalyptic number.

1660664631 is a deficient number, since it is larger than the sum of its proper divisors (553746633).

1660664631 is a wasteful number, since it uses less digits than its factorization.

1660664631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47941.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 1660664631 is about 40751.2531218366. The cubic root of 1660664631 is about 1184.2061495711.

The spelling of 1660664631 in words is "one billion, six hundred sixty million, six hundred sixty-four thousand, six hundred thirty-one".