18962638891 has 16 divisors (see below), whose sum is σ = 22002900480. Its totient is φ = 16005749760.

The previous prime is 18962638889. The next prime is 18962638969. The reversal of 18962638891 is 19883626981.

It is not a de Polignac number, because 18962638891 - 2¹ = 18962638889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18962638841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 404715 + ... + 449131.

It is an arithmetic number, because the mean of its divisors is an integer number (1375181280).

Almost surely, 2^18962638891 is an apocalyptic number.

18962638891 is a deficient number, since it is larger than the sum of its proper divisors (3040261589).

18962638891 is an equidigital number, since it uses as much as digits as its factorization.

18962638891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45354.

The product of its digits is 8957952, while the sum is 61.

The spelling of 18962638891 in words is "eighteen billion, nine hundred sixty-two million, six hundred thirty-eight thousand, eight hundred ninety-one".