30918471679 has 2 divisors, whose sum is σ = 30918471680. Its totient is φ = 30918471678.

The previous prime is 30918471641. The next prime is 30918471697. The reversal of 30918471679 is 97617481903.

Together with next prime (30918471697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30918471679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30918471179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15459235839 + 15459235840.

It is an arithmetic number, because the mean of its divisors is an integer number (15459235840).

Almost surely, 2^30918471679 is an apocalyptic number.

30918471679 is a deficient number, since it is larger than the sum of its proper divisors (1).

30918471679 is an equidigital number, since it uses as much as digits as its factorization.

30918471679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 30918471679 in words is "thirty billion, nine hundred eighteen million, four hundred seventy-one thousand, six hundred seventy-nine".