172071443385 has 48 divisors (see below), whose sum is σ = 300734294016. Its totient is φ = 91009868544.

The previous prime is 172071443303. The next prime is 172071443389. The reversal of 172071443385 is 583344170271.

172071443385 is a `hidden beast` number, since 1 + 7 + 207 + 1 + 4 + 433 + 8 + 5 = 666.

It is not a de Polignac number, because 172071443385 - 2¹² = 172071439289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 172071443385.

It is not an unprimeable number, because it can be changed into a prime (172071443389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17522997 + ... + 17532813.

It is an arithmetic number, because the mean of its divisors is an integer number (6265297792).

Almost surely, 2^172071443385 is an apocalyptic number.

172071443385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

172071443385 is a deficient number, since it is larger than the sum of its proper divisors (128662850631).

172071443385 is a wasteful number, since it uses less digits than its factorization.

172071443385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13022 (or 13019 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 172071443385 in words is "one hundred seventy-two billion, seventy-one million, four hundred forty-three thousand, three hundred eighty-five".