12681420551 has 4 divisors (see below), whose sum is σ = 12976337352. Its totient is φ = 12386503752.

The previous prime is 12681420541. The next prime is 12681420559. The reversal of 12681420551 is 15502418621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15502418621 = 269 ⋅57629809.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12681420551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12681420559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147458336 + ... + 147458421.

It is an arithmetic number, because the mean of its divisors is an integer number (3244084338).

Almost surely, 2^12681420551 is an apocalyptic number.

12681420551 is a deficient number, since it is larger than the sum of its proper divisors (294916801).

12681420551 is an equidigital number, since it uses as much as digits as its factorization.

12681420551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294916800.

The product of its (nonzero) digits is 19200, while the sum is 35.

The spelling of 12681420551 in words is "twelve billion, six hundred eighty-one million, four hundred twenty thousand, five hundred fifty-one".