12155972090 has 16 divisors (see below), whose sum is σ = 21883291560. Its totient is φ = 4861824000.

The previous prime is 12155972033. The next prime is 12155972093. The reversal of 12155972090 is 9027955121.

It can be written as a sum of positive squares in 4 ways, for example, as 10324388881 + 1831583209 = 101609^2 + 42797^2 .

It is not an unprimeable number, because it can be changed into a prime (12155972093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26090 + ... + 158090.

Almost surely, 2^12155972090 is an apocalyptic number.

12155972090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12155972090 is a deficient number, since it is larger than the sum of its proper divisors (9727319470).

12155972090 is a wasteful number, since it uses less digits than its factorization.

12155972090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141217.

The product of its (nonzero) digits is 56700, while the sum is 41.

The spelling of 12155972090 in words is "twelve billion, one hundred fifty-five million, nine hundred seventy-two thousand, ninety".