1315631664 has 60 divisors (see below), whose sum is σ = 3708486600. Its totient is φ = 435382272.

The previous prime is 1315631663. The next prime is 1315631689. The reversal of 1315631664 is 4661365131.

1315631664 is a `hidden beast` number, since 1 + 3 + 15 + 631 + 6 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1315631663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12849 + ... + 52880.

It is an arithmetic number, because the mean of its divisors is an integer number (61808110).

Almost surely, 2^1315631664 is an apocalyptic number.

It is an amenable number.

1315631664 is an abundant number, since it is smaller than the sum of its proper divisors (2392854936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315631664 is a wasteful number, since it uses less digits than its factorization.

1315631664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65882 (or 65873 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 1315631664 is about 36271.6371838934. The cubic root of 1315631664 is about 1095.7498985330.

Adding to 1315631664 its reverse (4661365131), we get a palindrome (5976996795).

The spelling of 1315631664 in words is "one billion, three hundred fifteen million, six hundred thirty-one thousand, six hundred sixty-four".