172605381381 has 32 divisors (see below), whose sum is σ = 263548454400. Its totient is φ = 111588632640.

The previous prime is 172605381371. The next prime is 172605381397. The reversal of 172605381381 is 183183506271.

It is a happy number.

172605381381 is a `hidden beast` number, since 1 + 7 + 2 + 605 + 3 + 8 + 1 + 38 + 1 = 666.

It is not a de Polignac number, because 172605381381 - 2⁹ = 172605380869 is a prime.

It is a super-2 number, since 2×172605381381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172605381341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 485610 + ... + 762251.

It is an arithmetic number, because the mean of its divisors is an integer number (8235889200).

Almost surely, 2^172605381381 is an apocalyptic number.

It is an amenable number.

172605381381 is a deficient number, since it is larger than the sum of its proper divisors (90943073019).

172605381381 is a wasteful number, since it uses less digits than its factorization.

172605381381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248026 (or 1248020 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 172605381381 in words is "one hundred seventy-two billion, six hundred five million, three hundred eighty-one thousand, three hundred eighty-one".