171961402597 has 4 divisors (see below), whose sum is σ = 172025786176. Its totient is φ = 171897019020.

The previous prime is 171961402559. The next prime is 171961402601. The reversal of 171961402597 is 795204169171.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 171961402597 - 2¹⁵ = 171961369829 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 (171961409597) 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, 32187783 + ... + 32193124.

It is an arithmetic number, because the mean of its divisors is an integer number (43006446544).

Almost surely, 2^171961402597 is an apocalyptic number.

It is an amenable number.

171961402597 is a deficient number, since it is larger than the sum of its proper divisors (64383579).

171961402597 is an equidigital number, since it uses as much as digits as its factorization.

171961402597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64383578.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 171961402597 in words is "one hundred seventy-one billion, nine hundred sixty-one million, four hundred two thousand, five hundred ninety-seven".