15420220155 has 32 divisors (see below), whose sum is σ = 27744030720. Its totient is φ = 8125025760.

The previous prime is 15420220133. The next prime is 15420220157. The reversal of 15420220155 is 55102202451.

15420220155 is a `hidden beast` number, since 1 + 5 + 420 + 220 + 15 + 5 = 666.

It is not a de Polignac number, because 15420220155 - 2¹⁰ = 15420219131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (15420220157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 676891 + ... + 699300.

It is an arithmetic number, because the mean of its divisors is an integer number (867000960).

Almost surely, 2^15420220155 is an apocalyptic number.

15420220155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15420220155 is a deficient number, since it is larger than the sum of its proper divisors (12323810565).

15420220155 is a wasteful number, since it uses less digits than its factorization.

15420220155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376288 (or 1376282 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The spelling of 15420220155 in words is "fifteen billion, four hundred twenty million, two hundred twenty thousand, one hundred fifty-five".