18923550157 has 2 divisors, whose sum is σ = 18923550158. Its totient is φ = 18923550156.

The previous prime is 18923550143. The next prime is 18923550167. The reversal of 18923550157 is 75105532981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12575603881 + 6347946276 = 112141^2 + 79674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18923550157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18923550167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461775078 + 9461775079.

It is an arithmetic number, because the mean of its divisors is an integer number (9461775079).

Almost surely, 2^18923550157 is an apocalyptic number.

It is an amenable number.

18923550157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923550157 is an equidigital number, since it uses as much as digits as its factorization.

18923550157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 18923550157 in words is "eighteen billion, nine hundred twenty-three million, five hundred fifty thousand, one hundred fifty-seven".