12561145311 has 32 divisors (see below), whose sum is σ = 19695836160. Its totient is φ = 7020201600.

The previous prime is 12561145307. The next prime is 12561145349. The reversal of 12561145311 is 11354116521.

It is not a de Polignac number, because 12561145311 - 2² = 12561145307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561145111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 431641 + ... + 459821.

It is an arithmetic number, because the mean of its divisors is an integer number (615494880).

Almost surely, 2^12561145311 is an apocalyptic number.

12561145311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12561145311 is a deficient number, since it is larger than the sum of its proper divisors (7134690849).

12561145311 is a wasteful number, since it uses less digits than its factorization.

12561145311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29247.

The product of its digits is 3600, while the sum is 30.

The spelling of 12561145311 in words is "twelve billion, five hundred sixty-one million, one hundred forty-five thousand, three hundred eleven".