1631596656 has 20 divisors (see below), whose sum is σ = 4214958152. Its totient is φ = 543865536.

The previous prime is 1631596643. The next prime is 1631596657. The reversal of 1631596656 is 6566951361.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 33991597 = 1631596656 / (1 + 6 + 3 + 1 + 5 + 9 + 6 + 6 + 5 + 6).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631596657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16995751 + ... + 16995846.

Almost surely, 2^1631596656 is an apocalyptic number.

1631596656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1631596656 is an abundant number, since it is smaller than the sum of its proper divisors (2583361496).

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

1631596656 is a wasteful number, since it uses less digits than its factorization.

1631596656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33991608 (or 33991602 counting only the distinct ones).

The product of its digits is 874800, while the sum is 48.

The square root of 1631596656 is about 40393.0273190807. The cubic root of 1631596656 is about 1177.2560622694.

The spelling of 1631596656 in words is "one billion, six hundred thirty-one million, five hundred ninety-six thousand, six hundred fifty-six".