18901794971 has 2 divisors, whose sum is σ = 18901794972. Its totient is φ = 18901794970.

The previous prime is 18901794959. The next prime is 18901795007. The reversal of 18901794971 is 17949710981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18901794971 - 2¹⁰ = 18901793947 is a prime.

It is not a weakly prime, because it can be changed into another prime (18901794911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9450897485 + 9450897486.

It is an arithmetic number, because the mean of its divisors is an integer number (9450897486).

Almost surely, 2^18901794971 is an apocalyptic number.

18901794971 is a deficient number, since it is larger than the sum of its proper divisors (1).

18901794971 is an equidigital number, since it uses as much as digits as its factorization.

18901794971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 56.

The spelling of 18901794971 in words is "eighteen billion, nine hundred one million, seven hundred ninety-four thousand, nine hundred seventy-one".