11990123155 has 4 divisors (see below), whose sum is σ = 14388147792. Its totient is φ = 9592098520.

The previous prime is 11990123153. The next prime is 11990123161. The reversal of 11990123155 is 55132109911.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11990123155 - 2¹ = 11990123153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11990123153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1199012311 + ... + 1199012320.

It is an arithmetic number, because the mean of its divisors is an integer number (3597036948).

Almost surely, 2^11990123155 is an apocalyptic number.

11990123155 is a deficient number, since it is larger than the sum of its proper divisors (2398024637).

11990123155 is an equidigital number, since it uses as much as digits as its factorization.

11990123155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398024636.

The product of its (nonzero) digits is 12150, while the sum is 37.

The spelling of 11990123155 in words is "eleven billion, nine hundred ninety million, one hundred twenty-three thousand, one hundred fifty-five".