1231266251553 has 8 divisors (see below), whose sum is σ = 1767972053568. Its totient is φ = 757702308624.

The previous prime is 1231266251543. The next prime is 1231266251563. The reversal of 1231266251553 is 3551526621321.

It is an interprime number because it is at equal distance from previous prime (1231266251543) and next prime (1231266251563).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231266251553 - 2⁸ = 1231266251297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1231266251543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15785464725 + ... + 15785464802.

It is an arithmetic number, because the mean of its divisors is an integer number (220996506696).

Almost surely, 2^{1231266251553} is an apocalyptic number.

1231266251553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1231266251553 is a deficient number, since it is larger than the sum of its proper divisors (536705802015).

1231266251553 is a wasteful number, since it uses less digits than its factorization.

1231266251553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31570929543.

The product of its digits is 324000, while the sum is 42.

The spelling of 1231266251553 in words is "one trillion, two hundred thirty-one billion, two hundred sixty-six million, two hundred fifty-one thousand, five hundred fifty-three".