17998457101 has 4 divisors (see below), whose sum is σ = 18075703932. Its totient is φ = 17921210272.

The previous prime is 17998457069. The next prime is 17998457129. The reversal of 17998457101 is 10175489971.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1861836201 + 16136620900 = 43149^2 + 127030^2 .

It is a cyclic number.

It is not a de Polignac number, because 17998457101 - 2⁵ = 17998457069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17998457131) 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, 38623066 + ... + 38623531.

It is an arithmetic number, because the mean of its divisors is an integer number (4518925983).

Almost surely, 2^17998457101 is an apocalyptic number.

It is an amenable number.

17998457101 is a deficient number, since it is larger than the sum of its proper divisors (77246831).

17998457101 is an equidigital number, since it uses as much as digits as its factorization.

17998457101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77246830.

The product of its (nonzero) digits is 635040, while the sum is 52.

The spelling of 17998457101 in words is "seventeen billion, nine hundred ninety-eight million, four hundred fifty-seven thousand, one hundred one".