18219639801 has 16 divisors (see below), whose sum is σ = 26654489280. Its totient is φ = 10978374720.

The previous prime is 18219639793. The next prime is 18219639829. The reversal of 18219639801 is 10893691281.

It is not a de Polignac number, because 18219639801 - 2³ = 18219639793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18219629801) 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, 1589986 + ... + 1601403.

It is an arithmetic number, because the mean of its divisors is an integer number (1665905580).

Almost surely, 2^18219639801 is an apocalyptic number.

18219639801 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18219639801 is a deficient number, since it is larger than the sum of its proper divisors (8434849479).

18219639801 is a wasteful number, since it uses less digits than its factorization.

18219639801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191576.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 18219639801 in words is "eighteen billion, two hundred nineteen million, six hundred thirty-nine thousand, eight hundred one".