18170770401 has 63 divisors (see below), whose sum is σ = 30856608913. Its totient is φ = 10304035560.

The previous prime is 18170770393. The next prime is 18170770417. The reversal of 18170770401 is 10407707181.

It is a happy number.

The square root of 18170770401 is 134799.

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

18170770401 is a `hidden beast` number, since 18 + 170 + 7 + 70 + 401 = 666.

It is a tau number, because it is divible by the number of its divisors (63).

It is not a de Polignac number, because 18170770401 - 2³ = 18170770393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18170770801) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 138708106 + ... + 138708236.

Almost surely, 2^18170770401 is an apocalyptic number.

18170770401 is the 134799-th square number.

18170770401 is the 67400-th centered octagonal number.

It is an amenable number.

18170770401 is a deficient number, since it is larger than the sum of its proper divisors (12685838512).

18170770401 is an frugal number, since it uses more digits than its factorization.

18170770401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 36.

Multiplying 18170770401 by its sum of digits (36), we get a square (654147734436 = 808794²).

The spelling of 18170770401 in words is "eighteen billion, one hundred seventy million, seven hundred seventy thousand, four hundred one".