2015981660 has 48 divisors (see below), whose sum is σ = 5278210560. Its totient is φ = 628357440.

The previous prime is 2015981659. The next prime is 2015981683. The reversal of 2015981660 is 661895102.

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, 653000 + ... + 656079.

It is an arithmetic number, because the mean of its divisors is an integer number (109962720).

Almost surely, 2^2015981660 is an apocalyptic number.

2015981660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015981660 is an abundant number, since it is smaller than the sum of its proper divisors (3262228900).

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

2015981660 is a wasteful number, since it uses less digits than its factorization.

2015981660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309106 (or 1309104 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 2015981660 is about 44899.6844086904. The cubic root of 2015981660 is about 1263.2680887645.

The spelling of 2015981660 in words is "two billion, fifteen million, nine hundred eighty-one thousand, six hundred sixty".