123115557105026 has 4 divisors (see below), whose sum is σ = 184673335657542. Its totient is φ = 61557778552512.

The previous prime is 123115557104993. The next prime is 123115557105053. The reversal of 123115557105026 is 620501755511321.

It is a Cunningham number, because it is equal to 11095745²+1.

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

It can be written as a sum of positive squares in only one way, i.e., 123115557105025 + 1 = 11095745^2 + 1^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778889276255 + ... + 30778889276258.

Almost surely, 2^{123115557105026} is an apocalyptic number.

123115557105026 is a deficient number, since it is larger than the sum of its proper divisors (61557778552516).

123115557105026 is an equidigital number, since it uses as much as digits as its factorization.

123115557105026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61557778552515.

The product of its (nonzero) digits is 315000, while the sum is 44.

The spelling of 123115557105026 in words is "one hundred twenty-three trillion, one hundred fifteen billion, five hundred fifty-seven million, one hundred five thousand, twenty-six".