1515111611660 has 24 divisors (see below), whose sum is σ = 3182198685120. Its totient is φ = 605956206464.

The previous prime is 1515111611647. The next prime is 1515111611669. The reversal of 1515111611660 is 661161115151.

It is a self number, because there is not a number n which added to its sum of digits gives 1515111611660.

It is not an unprimeable number, because it can be changed into a prime (1515111611669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5386820 + ... + 5661099.

It is an arithmetic number, because the mean of its divisors is an integer number (132591611880).

Almost surely, 2^{1515111611660} is an apocalyptic number.

1515111611660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1515111611660 is an abundant number, since it is smaller than the sum of its proper divisors (1667087073460).

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

1515111611660 is a wasteful number, since it uses less digits than its factorization.

1515111611660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11054785 (or 11054783 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 35.

The spelling of 1515111611660 in words is "one trillion, five hundred fifteen billion, one hundred eleven million, six hundred eleven thousand, six hundred sixty".