660187631 has 6 divisors (see below), whose sum is σ = 661625496. Its totient is φ = 658752600.

The previous prime is 660187609. The next prime is 660187637. The reversal of 660187631 is 136781066.

It is not a de Polignac number, because 660187631 - 2¹⁴ = 660171247 is a prime.

It is a super-2 number, since 2×660187631² = 871695416250784322, 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 (660187637) 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 5 ways as a sum of consecutive naturals, for example, 436166 + ... + 437676.

It is an arithmetic number, because the mean of its divisors is an integer number (110270916).

Almost surely, 2^660187631 is an apocalyptic number.

660187631 is a deficient number, since it is larger than the sum of its proper divisors (1437865).

660187631 is an frugal number, since it uses more digits than its factorization.

660187631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833 (or 2172 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 660187631 is about 25694.1166612125. The cubic root of 660187631 is about 870.7412676513.

The spelling of 660187631 in words is "six hundred sixty million, one hundred eighty-seven thousand, six hundred thirty-one".