18898512949 has 2 divisors, whose sum is σ = 18898512950. Its totient is φ = 18898512948.

The previous prime is 18898512937. The next prime is 18898512959. The reversal of 18898512949 is 94921589881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18699195025 + 199317924 = 136745^2 + 14118^2 .

It is a cyclic number.

It is not a de Polignac number, because 18898512949 - 2⁵ = 18898512917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18898512959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449256474 + 9449256475.

It is an arithmetic number, because the mean of its divisors is an integer number (9449256475).

Almost surely, 2^18898512949 is an apocalyptic number.

It is an amenable number.

18898512949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18898512949 is an equidigital number, since it uses as much as digits as its factorization.

18898512949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14929920, while the sum is 64.

The spelling of 18898512949 in words is "eighteen billion, eight hundred ninety-eight million, five hundred twelve thousand, nine hundred forty-nine".