818208893401 has 9 divisors (see below), whose sum is σ = 845483118453. Its totient is φ = 791787921660.

The previous prime is 818208893387. The next prime is 818208893429. The reversal of 818208893401 is 104398802818.

It is a happy number.

The square root of 818208893401 is 904549.

It is a perfect power (a square), and thus also a powerful number.

818208893401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 818208893401 - 2¹³ = 818208885209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818208893501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 28026430 + ... + 28055608.

It is an arithmetic number, because the mean of its divisors is an integer number (93942568717).

Almost surely, 2^818208893401 is an apocalyptic number.

818208893401 is the 904549-th square number.

818208893401 is the 452275-th centered octagonal number.

It is an amenable number.

818208893401 is a deficient number, since it is larger than the sum of its proper divisors (27274225052).

818208893401 is an frugal number, since it uses more digits than its factorization.

818208893401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58420 (or 29210 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 52.

The spelling of 818208893401 in words is "eight hundred eighteen billion, two hundred eight million, eight hundred ninety-three thousand, four hundred one".