12155320451999 has 4 divisors (see below), whose sum is σ = 12194155341936. Its totient is φ = 12116485562064.

The previous prime is 12155320451969. The next prime is 12155320452013. The reversal of 12155320451999 is 99915402355121.

12155320451999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12155320451999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155320451909) 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, 19417444499 + ... + 19417445124.

It is an arithmetic number, because the mean of its divisors is an integer number (3048538835484).

Almost surely, 2^{12155320451999} is an apocalyptic number.

12155320451999 is a deficient number, since it is larger than the sum of its proper divisors (38834889937).

12155320451999 is an equidigital number, since it uses as much as digits as its factorization.

12155320451999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38834889936.

The product of its (nonzero) digits is 4374000, while the sum is 56.

The spelling of 12155320451999 in words is "twelve trillion, one hundred fifty-five billion, three hundred twenty million, four hundred fifty-one thousand, nine hundred ninety-nine".