18061457639 has 2 divisors, whose sum is σ = 18061457640. Its totient is φ = 18061457638.

The previous prime is 18061457633. The next prime is 18061457663. The reversal of 18061457639 is 93675416081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18061457639 - 2¹⁶ = 18061392103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18061457633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9030728819 + 9030728820.

It is an arithmetic number, because the mean of its divisors is an integer number (9030728820).

Almost surely, 2^18061457639 is an apocalyptic number.

18061457639 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061457639 is an equidigital number, since it uses as much as digits as its factorization.

18061457639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 18061457639 in words is "eighteen billion, sixty-one million, four hundred fifty-seven thousand, six hundred thirty-nine".