123520617025 has 27 divisors (see below), whose sum is σ = 165884516361. Its totient is φ = 91198355040.

The previous prime is 123520617019. The next prime is 123520617041. The reversal of 123520617025 is 520716025321.

The square root of 123520617025 is 351455.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 31837621761 + 91682995264 = 178431^2 + 302792^2 .

It is not a de Polignac number, because 123520617025 - 2⁵ = 123520616993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 22841872 + ... + 22847278.

Almost surely, 2^123520617025 is an apocalyptic number.

123520617025 is the 351455-th square number.

123520617025 is the 175728-th centered octagonal number.

It is an amenable number.

123520617025 is a deficient number, since it is larger than the sum of its proper divisors (42363899336).

123520617025 is an frugal number, since it uses more digits than its factorization.

123520617025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10850 (or 5425 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 123520617025 in words is "one hundred twenty-three billion, five hundred twenty million, six hundred seventeen thousand, twenty-five".