1231455102555 has 64 divisors (see below), whose sum is σ = 2025310998528. Its totient is φ = 638687462400.

The previous prime is 1231455102547. The next prime is 1231455102589. The reversal of 1231455102555 is 5552015541321.

It is not a de Polignac number, because 1231455102555 - 2³ = 1231455102547 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, 54849342 + ... + 54871788.

It is an arithmetic number, because the mean of its divisors is an integer number (31645484352).

Almost surely, 2^{1231455102555} is an apocalyptic number.

1231455102555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231455102555 is a deficient number, since it is larger than the sum of its proper divisors (793855895973).

1231455102555 is a wasteful number, since it uses less digits than its factorization.

1231455102555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116.

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

The spelling of 1231455102555 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-five million, one hundred two thousand, five hundred fifty-five".