18902666437 has 2 divisors, whose sum is σ = 18902666438. Its totient is φ = 18902666436.

The previous prime is 18902666429. The next prime is 18902666473. The reversal of 18902666437 is 73466620981.

Together with next prime (18902666473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16727283556 + 2175382881 = 129334^2 + 46641^2 .

It is a cyclic number.

It is not a de Polignac number, because 18902666437 - 2³ = 18902666429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18902616437) 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, 9451333218 + 9451333219.

It is an arithmetic number, because the mean of its divisors is an integer number (9451333219).

Almost surely, 2^18902666437 is an apocalyptic number.

It is an amenable number.

18902666437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18902666437 is an equidigital number, since it uses as much as digits as its factorization.

18902666437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 18902666437 in words is "eighteen billion, nine hundred two million, six hundred sixty-six thousand, four hundred thirty-seven".