2156646384 has 240 divisors, whose sum is σ = 6740068608. Its totient is φ = 665127936.

The previous prime is 2156646383. The next prime is 2156646389. The reversal of 2156646384 is 4836466512.

2156646384 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 6 + 4 + 638 + 4 = 666.

It is a super-2 number, since 2×2156646384² = 9302247251240550912, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (829440) is a multiple of the sum of its prime divisors (576).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156646383) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4428189 + ... + 4428675.

Almost surely, 2^2156646384 is an apocalyptic number.

2156646384 is a gapful number since it is divisible by the number (24) 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 2156646384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3370034304).

2156646384 is an abundant number, since it is smaller than the sum of its proper divisors (4583422224).

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

2156646384 is a wasteful number, since it uses less digits than its factorization.

2156646384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 576 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 2156646384 is about 46439.7069758197. The cubic root of 2156646384 is about 1291.9914724330.

The spelling of 2156646384 in words is "two billion, one hundred fifty-six million, six hundred forty-six thousand, three hundred eighty-four".