15155561220 has 24 divisors (see below), whose sum is σ = 42435571584. Its totient is φ = 4041482976.

The previous prime is 15155561219. The next prime is 15155561257. The reversal of 15155561220 is 2216555151.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126296284 + ... + 126296403.

It is an arithmetic number, because the mean of its divisors is an integer number (1768148816).

Almost surely, 2^15155561220 is an apocalyptic number.

15155561220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15155561220 is an abundant number, since it is smaller than the sum of its proper divisors (27280010364).

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

15155561220 is a wasteful number, since it uses less digits than its factorization.

15155561220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252592699 (or 252592697 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 33.

The spelling of 15155561220 in words is "fifteen billion, one hundred fifty-five million, five hundred sixty-one thousand, two hundred twenty".