18950173997 has 2 divisors, whose sum is σ = 18950173998. Its totient is φ = 18950173996.

The previous prime is 18950173937. The next prime is 18950174021. The reversal of 18950173997 is 79937105981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17669321476 + 1280852521 = 132926^2 + 35789^2 .

It is a cyclic number.

It is not a de Polignac number, because 18950173997 - 2⁶ = 18950173933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18950173937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9475086998 + 9475086999.

It is an arithmetic number, because the mean of its divisors is an integer number (9475086999).

Almost surely, 2^18950173997 is an apocalyptic number.

It is an amenable number.

18950173997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18950173997 is an equidigital number, since it uses as much as digits as its factorization.

18950173997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4286520, while the sum is 59.

The spelling of 18950173997 in words is "eighteen billion, nine hundred fifty million, one hundred seventy-three thousand, nine hundred ninety-seven".