18640925419 has 2 divisors, whose sum is σ = 18640925420. Its totient is φ = 18640925418.

The previous prime is 18640925353. The next prime is 18640925447. The reversal of 18640925419 is 91452904681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18640925419 - 2¹⁵ = 18640892651 is a prime.

It is a super-2 number, since 2×18640925419² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18640925449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9320462709 + 9320462710.

It is an arithmetic number, because the mean of its divisors is an integer number (9320462710).

Almost surely, 2^18640925419 is an apocalyptic number.

18640925419 is a deficient number, since it is larger than the sum of its proper divisors (1).

18640925419 is an equidigital number, since it uses as much as digits as its factorization.

18640925419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 18640925419 in words is "eighteen billion, six hundred forty million, nine hundred twenty-five thousand, four hundred nineteen".