18312956951 has 4 divisors (see below), whose sum is σ = 18318248592. Its totient is φ = 18307665312.

The previous prime is 18312956939. The next prime is 18312956953. The reversal of 18312956951 is 15965921381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18312956951 - 2⁶ = 18312956887 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 18312956951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18312956953) 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, 2640626 + ... + 2647551.

It is an arithmetic number, because the mean of its divisors is an integer number (4579562148).

Almost surely, 2^18312956951 is an apocalyptic number.

18312956951 is a deficient number, since it is larger than the sum of its proper divisors (5291641).

18312956951 is an equidigital number, since it uses as much as digits as its factorization.

18312956951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5291640.

The product of its digits is 583200, while the sum is 50.

The spelling of 18312956951 in words is "eighteen billion, three hundred twelve million, nine hundred fifty-six thousand, nine hundred fifty-one".