17898390961201 has 3 divisors (see below), whose sum is σ = 17898395191851. Its totient is φ = 17898386730552.

The previous prime is 17898390961189. The next prime is 17898390961249. The reversal of 17898390961201 is 10216909389871.

The square root of 17898390961201 is 4230649.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13033190242801 + 4865200718400 = 3610151^2 + 2205720^2 .

It is not a de Polignac number, because 17898390961201 - 2¹⁵ = 17898390928433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17898390961001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2115325 + ... + 6345973.

It is an arithmetic number, because the mean of its divisors is an integer number (5966131730617).

Almost surely, 2^{17898390961201} is an apocalyptic number.

17898390961201 is the 4230649-th square number.

17898390961201 is the 2115325-th centered octagonal number.

It is an amenable number.

17898390961201 is a deficient number, since it is larger than the sum of its proper divisors (4230650).

17898390961201 is an frugal number, since it uses more digits than its factorization.

17898390961201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8461298 (or 4230649 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 64.

The spelling of 17898390961201 in words is "seventeen trillion, eight hundred ninety-eight billion, three hundred ninety million, nine hundred sixty-one thousand, two hundred one".