12540431553 has 12 divisors (see below), whose sum is σ = 18105712560. Its totient is φ = 7717188336.

The previous prime is 12540431551. The next prime is 12540431567. The reversal of 12540431553 is 35513404521.

It is not a de Polignac number, because 12540431553 - 2¹ = 12540431551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12540431551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12366783 + ... + 12367796.

It is an arithmetic number, because the mean of its divisors is an integer number (1508809380).

Almost surely, 2^12540431553 is an apocalyptic number.

12540431553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12540431553 is a deficient number, since it is larger than the sum of its proper divisors (5565281007).

12540431553 is a wasteful number, since it uses less digits than its factorization.

12540431553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24734608 (or 24734595 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 12540431553 in words is "twelve billion, five hundred forty million, four hundred thirty-one thousand, five hundred fifty-three".