79173016129 has 9 divisors (see below), whose sum is σ = 80710234633. Its totient is φ = 77664554032.

The previous prime is 79173016123. The next prime is 79173016157. The reversal of 79173016129 is 92161037197.

The square root of 79173016129 is 281377.

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

It can be written as a sum of positive squares in 4 ways, for example, as 18088905025 + 61084111104 = 134495^2 + 247152^2 .

It is not a de Polignac number, because 79173016129 - 2³¹ = 77025532481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79173016123) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14910327 + ... + 14915635.

Almost surely, 2^79173016129 is an apocalyptic number.

79173016129 is the 281377-th square number.

79173016129 is the 140689-th centered octagonal number.

It is an amenable number.

79173016129 is a deficient number, since it is larger than the sum of its proper divisors (1537218504).

79173016129 is an frugal number, since it uses more digits than its factorization.

79173016129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10724 (or 5362 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 79173016129 in words is "seventy-nine billion, one hundred seventy-three million, sixteen thousand, one hundred twenty-nine".