20150120555 has 32 divisors (see below), whose sum is σ = 24968079360. Its totient is φ = 15601662720.

The previous prime is 20150120461. The next prime is 20150120593. The reversal of 20150120555 is 55502105102.

It is a de Polignac number, because none of the positive numbers 2^k-20150120555 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17325404 + ... + 17326566.

It is an arithmetic number, because the mean of its divisors is an integer number (780252480).

Almost surely, 2^20150120555 is an apocalyptic number.

20150120555 is a deficient number, since it is larger than the sum of its proper divisors (4817958805).

20150120555 is a wasteful number, since it uses less digits than its factorization.

20150120555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811.

The product of its (nonzero) digits is 2500, while the sum is 26.

Adding to 20150120555 its reverse (55502105102), we get a palindrome (75652225657).

The spelling of 20150120555 in words is "twenty billion, one hundred fifty million, one hundred twenty thousand, five hundred fifty-five".