2015913357985 has 16 divisors (see below), whose sum is σ = 2562348632400. Its totient is φ = 1517299531776.

The previous prime is 2015913357979. The next prime is 2015913358037. The reversal of 2015913357985 is 5897533195102.

It can be written as a sum of positive squares in 8 ways, for example, as 32187589281 + 1983725768704 = 179409^2 + 1408448^2 .

It is a cyclic number.

It is not a de Polignac number, because 2015913357985 - 2²⁷ = 2015779140257 is a prime.

It is a super-3 number, since 3×2015913357985³ (a number of 38 digits) contains 333 as substring.

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, 4181370 + ... + 4638499.

It is an arithmetic number, because the mean of its divisors is an integer number (160146789525).

Almost surely, 2^{2015913357985} is an apocalyptic number.

It is an amenable number.

2015913357985 is a deficient number, since it is larger than the sum of its proper divisors (546435274415).

2015913357985 is a wasteful number, since it uses less digits than its factorization.

2015913357985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8822580.

The product of its (nonzero) digits is 10206000, while the sum is 58.

The spelling of 2015913357985 in words is "two trillion, fifteen billion, nine hundred thirteen million, three hundred fifty-seven thousand, nine hundred eighty-five".