8172137506 has 8 divisors (see below), whose sum is σ = 13201145244.
Its totient is φ = 3771755760.
The previous prime is 8172137489. The next prime is 8172137539. The reversal of 8172137506 is 6057312718.
It can be written as a sum of positive squares in 2 ways, for example, as 7206481881 + 965655625 = 84891^2 + 31075^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is an unprimeable number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157156465 + ... + 157156516.
Almost surely, 28172137506 is an apocalyptic number.
8172137506 is a deficient number, since it is larger than the sum of its proper divisors (5029007738).
8172137506 is a wasteful number, since it uses less digits than its factorization.
8172137506 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 314312996.
The product of its (nonzero) digits is 70560, while the sum is 40.
The square root of 8172137506 is about 90399.8755861976.
The cubic root of 8172137506 is about 2014.2431181715.
The spelling of 8172137506 in words is "eight billion, one hundred seventy-two million, one hundred thirty-seven thousand, five hundred six".