15221245455 has 24 divisors (see below), whose sum is σ = 28412992608. Its totient is φ = 7493535936.

The previous prime is 15221245453. The next prime is 15221245471. The reversal of 15221245455 is 55454212251.

15221245455 is a `hidden beast` number, since 1 + 522 + 124 + 5 + 4 + 5 + 5 = 666.

It is not a de Polignac number, because 15221245455 - 2¹ = 15221245453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15221245451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13009027 + ... + 13010196.

It is an arithmetic number, because the mean of its divisors is an integer number (1183874692).

Almost surely, 2^15221245455 is an apocalyptic number.

15221245455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15221245455 is a deficient number, since it is larger than the sum of its proper divisors (13191747153).

15221245455 is a wasteful number, since it uses less digits than its factorization.

15221245455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26019247 (or 26019244 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

The spelling of 15221245455 in words is "fifteen billion, two hundred twenty-one million, two hundred forty-five thousand, four hundred fifty-five".