179978189997 has 4 divisors (see below), whose sum is σ = 239970920000. Its totient is φ = 119985459996.

The previous prime is 179978189987. The next prime is 179978189999. The reversal of 179978189997 is 799981879971.

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, and also an emirpimes, since its reverse is a distinct semiprime: 799981879971 = 3 ⋅266660626657.

It is not a de Polignac number, because 179978189997 - 2²⁴ = 179961412781 is a prime.

It is a super-3 number, since 3×179978189997³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (179978189999) 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, 29996364997 + ... + 29996365002.

It is an arithmetic number, because the mean of its divisors is an integer number (59992730000).

Almost surely, 2^179978189997 is an apocalyptic number.

It is an amenable number.

179978189997 is a deficient number, since it is larger than the sum of its proper divisors (59992730003).

179978189997 is an equidigital number, since it uses as much as digits as its factorization.

179978189997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59992730002.

The product of its digits is 1296243648, while the sum is 84.

The spelling of 179978189997 in words is "one hundred seventy-nine billion, nine hundred seventy-eight million, one hundred eighty-nine thousand, nine hundred ninety-seven".