123120521525505 has 64 divisors (see below), whose sum is σ = 226858498910208. Its totient is φ = 55852729121280.

The previous prime is 123120521525459. The next prime is 123120521525539. The reversal of 123120521525505 is 505525125021321.

It is not a de Polignac number, because 123120521525505 - 2²⁷ = 123120387307777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 846506269 + ... + 846651701.

It is an arithmetic number, because the mean of its divisors is an integer number (3544664045472).

Almost surely, 2^{123120521525505} is an apocalyptic number.

123120521525505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123120521525505 is a deficient number, since it is larger than the sum of its proper divisors (103737977384703).

123120521525505 is a wasteful number, since it uses less digits than its factorization.

123120521525505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207126.

The product of its (nonzero) digits is 150000, while the sum is 39.

Adding to 123120521525505 its reverse (505525125021321), we get a palindrome (628645646546826).

The spelling of 123120521525505 in words is "one hundred twenty-three trillion, one hundred twenty billion, five hundred twenty-one million, five hundred twenty-five thousand, five hundred five".