18461894669 has 2 divisors, whose sum is σ = 18461894670. Its totient is φ = 18461894668.

The previous prime is 18461894639. The next prime is 18461894713. The reversal of 18461894669 is 96649816481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12580538569 + 5881356100 = 112163^2 + 76690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18461894669 is a prime.

It is a super-2 number, since 2×18461894669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18461894629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9230947334 + 9230947335.

It is an arithmetic number, because the mean of its divisors is an integer number (9230947335).

Almost surely, 2^18461894669 is an apocalyptic number.

It is an amenable number.

18461894669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18461894669 is an equidigital number, since it uses as much as digits as its factorization.

18461894669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 62.

The spelling of 18461894669 in words is "eighteen billion, four hundred sixty-one million, eight hundred ninety-four thousand, six hundred sixty-nine".