2516021615 has 4 divisors (see below), whose sum is σ = 3019225944. Its totient is φ = 2012817288.

The previous prime is 2516021569. The next prime is 2516021617. The reversal of 2516021615 is 5161206152.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2516021615 - 2²⁰ = 2514973039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2516021617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251602157 + ... + 251602166.

It is an arithmetic number, because the mean of its divisors is an integer number (754806486).

Almost surely, 2^2516021615 is an apocalyptic number.

2516021615 is a deficient number, since it is larger than the sum of its proper divisors (503204329).

2516021615 is an equidigital number, since it uses as much as digits as its factorization.

2516021615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503204328.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 2516021615 is about 50159.9602770975. The cubic root of 2516021615 is about 1360.1019270133.

Adding to 2516021615 its reverse (5161206152), we get a palindrome (7677227767).

The spelling of 2516021615 in words is "two billion, five hundred sixteen million, twenty-one thousand, six hundred fifteen".