12540140643 has 8 divisors (see below), whose sum is σ = 16725312256. Its totient is φ = 8357531400.

The previous prime is 12540140623. The next prime is 12540140651. The reversal of 12540140643 is 34604104521.

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

It is not a de Polignac number, because 12540140643 - 2⁶ = 12540140579 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12540140643.

It is not an unprimeable number, because it can be changed into a prime (12540140623) 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, 629143 + ... + 648768.

It is an arithmetic number, because the mean of its divisors is an integer number (2090664032).

Almost surely, 2^12540140643 is an apocalyptic number.

12540140643 is a deficient number, since it is larger than the sum of its proper divisors (4185171613).

12540140643 is a wasteful number, since it uses less digits than its factorization.

12540140643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281185.

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 12540140643 in words is "twelve billion, five hundred forty million, one hundred forty thousand, six hundred forty-three".