15155561212 has 36 divisors (see below), whose sum is σ = 30420060048. Its totient is φ = 6589369600.

The previous prime is 15155561131. The next prime is 15155561219. The reversal of 15155561212 is 21216555151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15155561219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 669589 + ... + 691852.

It is an arithmetic number, because the mean of its divisors is an integer number (845001668).

Almost surely, 2^15155561212 is an apocalyptic number.

It is an amenable number.

15155561212 is an abundant number, since it is smaller than the sum of its proper divisors (15264498836).

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

15155561212 is a wasteful number, since it uses less digits than its factorization.

15155561212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361490 (or 1361477 counting only the distinct ones).

The product of its digits is 15000, while the sum is 34.

The spelling of 15155561212 in words is "fifteen billion, one hundred fifty-five million, five hundred sixty-one thousand, two hundred twelve".