123556444051 has 4 divisors (see below), whose sum is σ = 123559315704. Its totient is φ = 123553572400.

The previous prime is 123556444021. The next prime is 123556444177. The reversal of 123556444051 is 150444655321.

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

It is a cyclic number.

It is not a de Polignac number, because 123556444051 - 2²⁵ = 123522889619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123556443995 and 123556444013.

It is not an unprimeable number, because it can be changed into a prime (123556444001) 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 3 ways as a sum of consecutive naturals, for example, 1370290 + ... + 1457671.

It is an arithmetic number, because the mean of its divisors is an integer number (30889828926).

Almost surely, 2^123556444051 is an apocalyptic number.

123556444051 is a deficient number, since it is larger than the sum of its proper divisors (2871653).

123556444051 is an equidigital number, since it uses as much as digits as its factorization.

123556444051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871652.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 123556444051 in words is "one hundred twenty-three billion, five hundred fifty-six million, four hundred forty-four thousand, fifty-one".