18962638897 has 4 divisors (see below), whose sum is σ = 18996320880. Its totient is φ = 18928956916.

The previous prime is 18962638889. The next prime is 18962638969. The reversal of 18962638897 is 79883626981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79883626981 = 43 ⋅1857758767.

It is a cyclic number.

It is not a de Polignac number, because 18962638897 - 2³ = 18962638889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18962638297) 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, 16840147 + ... + 16841272.

It is an arithmetic number, because the mean of its divisors is an integer number (4749080220).

Almost surely, 2^18962638897 is an apocalyptic number.

It is an amenable number.

18962638897 is a deficient number, since it is larger than the sum of its proper divisors (33681983).

18962638897 is an equidigital number, since it uses as much as digits as its factorization.

18962638897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33681982.

The product of its digits is 62705664, while the sum is 67.

The spelling of 18962638897 in words is "eighteen billion, nine hundred sixty-two million, six hundred thirty-eight thousand, eight hundred ninety-seven".