2516661644 has 96 divisors (see below), whose sum is σ = 5521152000. Its totient is φ = 979340544.

The previous prime is 2516661643. The next prime is 2516661709. The reversal of 2516661644 is 4461666152.

It is not an unprimeable number, because it can be changed into a prime (2516661643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2421677 + ... + 2422715.

It is an arithmetic number, because the mean of its divisors is an integer number (57512000).

Almost surely, 2^2516661644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2516661644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2760576000).

2516661644 is an abundant number, since it is smaller than the sum of its proper divisors (3004490356).

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

2516661644 is a wasteful number, since it uses less digits than its factorization.

2516661644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255 (or 1253 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 2516661644 is about 50166.3397508728. The cubic root of 2516661644 is about 1360.2172454282.

The spelling of 2516661644 in words is "two billion, five hundred sixteen million, six hundred sixty-one thousand, six hundred forty-four".