2015813655 has 16 divisors (see below), whose sum is σ = 3583668960. Its totient is φ = 1075100544.

The previous prime is 2015813623. The next prime is 2015813663. The reversal of 2015813655 is 5563185102.

It is a happy number.

2015813655 is a `hidden beast` number, since 20 + 1 + 581 + 3 + 6 + 55 = 666.

It is not a de Polignac number, because 2015813655 - 2⁵ = 2015813623 is a prime.

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, 7465842 + ... + 7466111.

It is an arithmetic number, because the mean of its divisors is an integer number (223979310).

Almost surely, 2^2015813655 is an apocalyptic number.

2015813655 is a deficient number, since it is larger than the sum of its proper divisors (1567855305).

2015813655 is a wasteful number, since it uses less digits than its factorization.

2015813655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14931967 (or 14931961 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 2015813655 is about 44897.8134768276. The cubic root of 2015813655 is about 1263.2329956458.

Adding to 2015813655 its reverse (5563185102), we get a palindrome (7578998757).

The spelling of 2015813655 in words is "two billion, fifteen million, eight hundred thirteen thousand, six hundred fifty-five".