17220401172 has 144 divisors (see below), whose sum is σ = 49684635840. Its totient is φ = 5127261120.

The previous prime is 17220401153. The next prime is 17220401197. The reversal of 17220401172 is 27110402271.

It is a happy number.

17220401172 is a `hidden beast` number, since 1 + 72 + 20 + 401 + 172 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1342863 + ... + 1355625.

Almost surely, 2^17220401172 is an apocalyptic number.

17220401172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17220401172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24842317920).

17220401172 is an abundant number, since it is smaller than the sum of its proper divisors (32464234668).

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

17220401172 is a wasteful number, since it uses less digits than its factorization.

17220401172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12851 (or 12812 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The spelling of 17220401172 in words is "seventeen billion, two hundred twenty million, four hundred one thousand, one hundred seventy-two".