1864555056 has 180 divisors, whose sum is σ = 6537362832. Its totient is φ = 491726592.

The previous prime is 1864555039. The next prime is 1864555093. The reversal of 1864555056 is 6505554681.

1864555056 is a `hidden beast` number, since 1 + 8 + 6 + 45 + 550 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 81565 + ... + 101891.

Almost surely, 2^1864555056 is an apocalyptic number.

1864555056 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 1864555056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3268681416).

1864555056 is an abundant number, since it is smaller than the sum of its proper divisors (4672807776).

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

1864555056 is a wasteful number, since it uses less digits than its factorization.

1864555056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20368 (or 20352 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The square root of 1864555056 is about 43180.4939295511. The cubic root of 1864555056 is about 1230.8120435860.

The spelling of 1864555056 in words is "one billion, eight hundred sixty-four million, five hundred fifty-five thousand, fifty-six".