18950361893 has 4 divisors (see below), whose sum is σ = 18950793900. Its totient is φ = 18949929888.

The previous prime is 18950361889. The next prime is 18950361919. The reversal of 18950361893 is 39816305981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8121253924 + 10829107969 = 90118^2 + 104063^2 .

It is a cyclic number.

It is not a de Polignac number, because 18950361893 - 2² = 18950361889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18950367893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141680 + ... + 240777.

It is an arithmetic number, because the mean of its divisors is an integer number (4737698475).

Almost surely, 2^18950361893 is an apocalyptic number.

It is an amenable number.

18950361893 is a deficient number, since it is larger than the sum of its proper divisors (432007).

18950361893 is an equidigital number, since it uses as much as digits as its factorization.

18950361893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432006.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 18950361893 in words is "eighteen billion, nine hundred fifty million, three hundred sixty-one thousand, eight hundred ninety-three".