18172149407 has 2 divisors, whose sum is σ = 18172149408. Its totient is φ = 18172149406.

The previous prime is 18172149349. The next prime is 18172149421. The reversal of 18172149407 is 70494127181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18172149407 - 2¹⁰ = 18172148383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18172149427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9086074703 + 9086074704.

It is an arithmetic number, because the mean of its divisors is an integer number (9086074704).

Almost surely, 2^18172149407 is an apocalyptic number.

18172149407 is a deficient number, since it is larger than the sum of its proper divisors (1).

18172149407 is an equidigital number, since it uses as much as digits as its factorization.

18172149407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 44.

The spelling of 18172149407 in words is "eighteen billion, one hundred seventy-two million, one hundred forty-nine thousand, four hundred seven".