660651431 has 8 divisors (see below), whose sum is σ = 721592064. Its totient is φ = 599857720.

The previous prime is 660651427. The next prime is 660651443. The reversal of 660651431 is 134156066.

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

It is not a de Polignac number, because 660651431 - 2² = 660651427 is a prime.

It is a super-2 number, since 2×660651431² = 872920626564695522, 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 (660651461) 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 7 ways as a sum of consecutive naturals, for example, 27215 + ... + 45408.

It is an arithmetic number, because the mean of its divisors is an integer number (90199008).

Almost surely, 2^660651431 is an apocalyptic number.

660651431 is a deficient number, since it is larger than the sum of its proper divisors (60940633).

660651431 is a wasteful number, since it uses less digits than its factorization.

660651431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73461.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 660651431 is about 25703.1404890531. The cubic root of 660651431 is about 870.9451264969.

The spelling of 660651431 in words is "six hundred sixty million, six hundred fifty-one thousand, four hundred thirty-one".