179172468421 has 2 divisors, whose sum is σ = 179172468422. Its totient is φ = 179172468420.

The previous prime is 179172468401. The next prime is 179172468443. The reversal of 179172468421 is 124864271971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146008052100 + 33164416321 = 382110^2 + 182111^2 .

It is a cyclic number.

It is not a de Polignac number, because 179172468421 - 2²⁷ = 179038250693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (179172468401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 89586234210 + 89586234211.

It is an arithmetic number, because the mean of its divisors is an integer number (89586234211).

Almost surely, 2^179172468421 is an apocalyptic number.

It is an amenable number.

179172468421 is a deficient number, since it is larger than the sum of its proper divisors (1).

179172468421 is an equidigital number, since it uses as much as digits as its factorization.

179172468421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 52.

The spelling of 179172468421 in words is "one hundred seventy-nine billion, one hundred seventy-two million, four hundred sixty-eight thousand, four hundred twenty-one".