1951955856 has 90 divisors (see below), whose sum is σ = 5542849910. Its totient is φ = 641249280.

The previous prime is 1951955843. The next prime is 1951955891. The reversal of 1951955856 is 6585591591.

1951955856 is a `hidden beast` number, since 1 + 9 + 51 + 9 + 5 + 585 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1161446400 + 790509456 = 34080^2 + 28116^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 724560 + ... + 727248.

Almost surely, 2^1951955856 is an apocalyptic number.

1951955856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1951955856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2771424955).

1951955856 is an abundant number, since it is smaller than the sum of its proper divisors (3590894054).

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

1951955856 is a wasteful number, since it uses less digits than its factorization.

1951955856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2845 (or 2765 counting only the distinct ones).

The product of its digits is 2430000, while the sum is 54.

The square root of 1951955856 is about 44180.9444896779. The cubic root of 1951955856 is about 1249.7505328296.

The spelling of 1951955856 in words is "one billion, nine hundred fifty-one million, nine hundred fifty-five thousand, eight hundred fifty-six".