20115016615 has 16 divisors (see below), whose sum is σ = 25839100800. Its totient is φ = 14986670112.

The previous prime is 20115016591. The next prime is 20115016651. The reversal of 20115016615 is 51661051102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20115016615 - 2²⁵ = 20081462183 is a prime.

It is a super-2 number, since 2×20115016615² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1788777 + ... + 1799986.

It is an arithmetic number, because the mean of its divisors is an integer number (1614943800).

Almost surely, 2^20115016615 is an apocalyptic number.

20115016615 is a deficient number, since it is larger than the sum of its proper divisors (5724084185).

20115016615 is a wasteful number, since it uses less digits than its factorization.

20115016615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3588846.

The product of its (nonzero) digits is 1800, while the sum is 28.

Adding to 20115016615 its reverse (51661051102), we get a palindrome (71776067717).

The spelling of 20115016615 in words is "twenty billion, one hundred fifteen million, sixteen thousand, six hundred fifteen".