2158815564 has 60 divisors (see below), whose sum is σ = 5838201600. Its totient is φ = 694788192.

The previous prime is 2158815551. The next prime is 2158815577. The reversal of 2158815564 is 4655188512.

2158815564 is a `hidden beast` number, since 2 + 1 + 5 + 8 + 81 + 5 + 564 = 666.

It is an interprime number because it is at equal distance from previous prime (2158815551) and next prime (2158815577).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 105484 + ... + 124275.

It is an arithmetic number, because the mean of its divisors is an integer number (97303360).

Almost surely, 2^2158815564 is an apocalyptic number.

It is an amenable number.

2158815564 is an abundant number, since it is smaller than the sum of its proper divisors (3679386036).

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

2158815564 is a wasteful number, since it uses less digits than its factorization.

2158815564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229804 (or 229793 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The square root of 2158815564 is about 46463.0559046647. The cubic root of 2158815564 is about 1292.4244939660.

It can be divided in two parts, 215881 and 5564, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 2158815564 in words is "two billion, one hundred fifty-eight million, eight hundred fifteen thousand, five hundred sixty-four".