1631366856 has 96 divisors (see below), whose sum is σ = 5067878400. Its totient is φ = 464405760.

The previous prime is 1631366797. The next prime is 1631366857. The reversal of 1631366856 is 6586631361.

1631366856 is a `hidden beast` number, since 1 + 631 + 3 + 6 + 6 + 8 + 5 + 6 = 666.

It is a super-2 number, since 2×1631366856² = 5322715637710649472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1631366857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135865 + ... + 147383.

It is an arithmetic number, because the mean of its divisors is an integer number (52790400).

Almost surely, 2^1631366856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631366856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2533939200).

1631366856 is an abundant number, since it is smaller than the sum of its proper divisors (3436511544).

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

1631366856 is a wasteful number, since it uses less digits than its factorization.

1631366856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11819 (or 11812 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1631366856 is about 40390.1826685644. The cubic root of 1631366856 is about 1177.2007900010.

The spelling of 1631366856 in words is "one billion, six hundred thirty-one million, three hundred sixty-six thousand, eight hundred fifty-six".