171992678399 has 8 divisors (see below), whose sum is σ = 172839540720. Its totient is φ = 171146649600.

The previous prime is 171992678371. The next prime is 171992678401. The reversal of 171992678399 is 993876299171.

It is a Cunningham number, because it is equal to 414720²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171992678399 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 (171992678329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207359 + ... + 622079.

It is an arithmetic number, because the mean of its divisors is an integer number (21604942590).

Almost surely, 2^171992678399 is an apocalyptic number.

171992678399 is a deficient number, since it is larger than the sum of its proper divisors (846862321).

171992678399 is a wasteful number, since it uses less digits than its factorization.

171992678399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416761.

The product of its digits is 92588832, while the sum is 71.

The spelling of 171992678399 in words is "one hundred seventy-one billion, nine hundred ninety-two million, six hundred seventy-eight thousand, three hundred ninety-nine".