18928206401 has 4 divisors (see below), whose sum is σ = 20384222292. Its totient is φ = 17472190512.

The previous prime is 18928206397. The next prime is 18928206403. The reversal of 18928206401 is 10460282981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10460282981 = 307 ⋅34072583.

It can be written as a sum of positive squares in 2 ways, for example, as 2900899600 + 16027306801 = 53860^2 + 126599^2 .

It is a cyclic number.

It is not a de Polignac number, because 18928206401 - 2² = 18928206397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18928206403) 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, 728007926 + ... + 728007951.

It is an arithmetic number, because the mean of its divisors is an integer number (5096055573).

Almost surely, 2^18928206401 is an apocalyptic number.

It is an amenable number.

18928206401 is a deficient number, since it is larger than the sum of its proper divisors (1456015891).

18928206401 is a wasteful number, since it uses less digits than its factorization.

18928206401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456015890.

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 18928206401 in words is "eighteen billion, nine hundred twenty-eight million, two hundred six thousand, four hundred one".