2015561012 has 6 divisors (see below), whose sum is σ = 3527231778. Its totient is φ = 1007780504.

The previous prime is 2015561011. The next prime is 2015561027. The reversal of 2015561012 is 2101655102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2013855376 + 1705636 = 44876^2 + 1306^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015561011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251945123 + ... + 251945130.

It is an arithmetic number, because the mean of its divisors is an integer number (587871963).

Almost surely, 2^2015561012 is an apocalyptic number.

It is an amenable number.

2015561012 is a deficient number, since it is larger than the sum of its proper divisors (1511670766).

2015561012 is a wasteful number, since it uses less digits than its factorization.

2015561012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503890257 (or 503890255 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 2015561012 is about 44894.9998552177. Note that the first 3 decimals coincide. The cubic root of 2015561012 is about 1263.1802195527.

The spelling of 2015561012 in words is "two billion, fifteen million, five hundred sixty-one thousand, twelve".