18916897651 has 2 divisors, whose sum is σ = 18916897652. Its totient is φ = 18916897650.

The previous prime is 18916897633. The next prime is 18916897661. The reversal of 18916897651 is 15679861981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18916897651 - 2¹¹ = 18916895603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18916897651.

It is not a weakly prime, because it can be changed into another prime (18916897661) 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, 9458448825 + 9458448826.

It is an arithmetic number, because the mean of its divisors is an integer number (9458448826).

Almost surely, 2^18916897651 is an apocalyptic number.

18916897651 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916897651 is an equidigital number, since it uses as much as digits as its factorization.

18916897651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 61.

The spelling of 18916897651 in words is "eighteen billion, nine hundred sixteen million, eight hundred ninety-seven thousand, six hundred fifty-one".