123665235555 has 16 divisors (see below), whose sum is σ = 199713579264. Its totient is φ = 65338391520.

The previous prime is 123665235541. The next prime is 123665235593. The reversal of 123665235555 is 555532566321.

It is not a de Polignac number, because 123665235555 - 2⁴ = 123665235539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38523391 + ... + 38526600.

It is an arithmetic number, because the mean of its divisors is an integer number (12482098704).

Almost surely, 2^123665235555 is an apocalyptic number.

123665235555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123665235555 is a deficient number, since it is larger than the sum of its proper divisors (76048343709).

123665235555 is a wasteful number, since it uses less digits than its factorization.

123665235555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77050106.

The product of its digits is 4050000, while the sum is 48.

The spelling of 123665235555 in words is "one hundred twenty-three billion, six hundred sixty-five million, two hundred thirty-five thousand, five hundred fifty-five".