2516421564 has 18 divisors (see below), whose sum is σ = 6360954600. Its totient is φ = 838807176.

The previous prime is 2516421539. The next prime is 2516421581. The reversal of 2516421564 is 4651246152.

2516421564 is a `hidden beast` number, since 2 + 5 + 1 + 642 + 1 + 5 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 69900599 = 2516421564 / (2 + 5 + 1 + 6 + 4 + 2 + 1 + 5 + 6 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34950264 + ... + 34950335.

Almost surely, 2^2516421564 is an apocalyptic number.

It is an amenable number.

2516421564 is an abundant number, since it is smaller than the sum of its proper divisors (3844533036).

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

2516421564 is a wasteful number, since it uses less digits than its factorization.

2516421564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69900609 (or 69900604 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 2516421564 is about 50163.9468542897. The cubic root of 2516421564 is about 1360.1739908596.

The spelling of 2516421564 in words is "two billion, five hundred sixteen million, four hundred twenty-one thousand, five hundred sixty-four".