72446400171 has 6 divisors (see below), whose sum is σ = 104644800260. Its totient is φ = 48297600108.

The previous prime is 72446400163. The next prime is 72446400223. The reversal of 72446400171 is 17100464427.

It is a happy number.

72446400171 is a `hidden beast` number, since 7 + 2 + 4 + 4 + 640 + 0 + 1 + 7 + 1 = 666.

It is not a de Polignac number, because 72446400171 - 2³ = 72446400163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72446400121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4024800001 + ... + 4024800018.

Almost surely, 2^72446400171 is an apocalyptic number.

72446400171 is a deficient number, since it is larger than the sum of its proper divisors (32198400089).

72446400171 is a wasteful number, since it uses less digits than its factorization.

72446400171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049600025 (or 8049600022 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

Adding to 72446400171 its reverse (17100464427), we get a palindrome (89546864598).

The spelling of 72446400171 in words is "seventy-two billion, four hundred forty-six million, four hundred thousand, one hundred seventy-one".