172381856263 has 4 divisors (see below), whose sum is σ = 181454585560. Its totient is φ = 163309126968.

The previous prime is 172381856249. The next prime is 172381856303. The reversal of 172381856263 is 362658183271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362658183271 = 59 ⋅6146748869.

It is a cyclic number.

It is not a de Polignac number, because 172381856263 - 2³⁷ = 34942902791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172381856263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172381856233) 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 3 ways as a sum of consecutive naturals, for example, 4536364620 + ... + 4536364657.

It is an arithmetic number, because the mean of its divisors is an integer number (45363646390).

Almost surely, 2^172381856263 is an apocalyptic number.

172381856263 is a deficient number, since it is larger than the sum of its proper divisors (9072729297).

172381856263 is an equidigital number, since it uses as much as digits as its factorization.

172381856263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9072729296.

The product of its digits is 2903040, while the sum is 52.

The spelling of 172381856263 in words is "one hundred seventy-two billion, three hundred eighty-one million, eight hundred fifty-six thousand, two hundred sixty-three".