18077947831 has 2 divisors, whose sum is σ = 18077947832. Its totient is φ = 18077947830.

The previous prime is 18077947799. The next prime is 18077947889. The reversal of 18077947831 is 13874977081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18077947831 - 2⁵ = 18077947799 is a prime.

It is a super-3 number, since 3×18077947831³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18077977831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9038973915 + 9038973916.

It is an arithmetic number, because the mean of its divisors is an integer number (9038973916).

Almost surely, 2^18077947831 is an apocalyptic number.

18077947831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18077947831 is an equidigital number, since it uses as much as digits as its factorization.

18077947831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The spelling of 18077947831 in words is "eighteen billion, seventy-seven million, nine hundred forty-seven thousand, eight hundred thirty-one".