172016317506 has 64 divisors (see below), whose sum is σ = 381298337280. Its totient is φ = 51300226560.

The previous prime is 172016317469. The next prime is 172016317507. The reversal of 172016317506 is 605713610271.

It is a super-2 number, since 2×172016317506² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172016317507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1070905 + ... + 1221011.

It is an arithmetic number, because the mean of its divisors is an integer number (5957786520).

Almost surely, 2^172016317506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172016317506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190649168640).

172016317506 is an abundant number, since it is smaller than the sum of its proper divisors (209282019774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172016317506 is a wasteful number, since it uses less digits than its factorization.

172016317506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150399.

The product of its (nonzero) digits is 52920, while the sum is 39.

Adding to 172016317506 its reverse (605713610271), we get a palindrome (777729927777).

The spelling of 172016317506 in words is "one hundred seventy-two billion, sixteen million, three hundred seventeen thousand, five hundred six".