8172137505 has 32 divisors (see below), whose sum is σ = 15458630400.
Its totient is φ = 3607011072.
The previous prime is 8172137489. The next prime is 8172137539. The reversal of 8172137505 is 5057312718.
It is not a de Polignac number, because 8172137505 - 24 = 8172137489 is a prime.
It is an unprimeable number.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1338850 + ... + 1344939.
It is an arithmetic number, because the mean of its divisors is an integer number (483082200).
Almost surely, 28172137505 is an apocalyptic number.
It is an amenable number.
8172137505 is a deficient number, since it is larger than the sum of its proper divisors (7286492895).
8172137505 is a wasteful number, since it uses less digits than its factorization.
8172137505 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2683833.
The product of its (nonzero) digits is 58800, while the sum is 39.
The square root of 8172137505 is about 90399.8755806666.
The cubic root of 8172137505 is about 2014.2431180894.
The spelling of 8172137505 in words is "eight billion, one hundred seventy-two million, one hundred thirty-seven thousand, five hundred five".