181875406645 has 8 divisors (see below), whose sum is σ = 218253026304. Its totient is φ = 145498633104.

The previous prime is 181875406639. The next prime is 181875406651. The reversal of 181875406645 is 546604578181.

It is an interprime number because it is at equal distance from previous prime (181875406639) and next prime (181875406651).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181875406645 - 2⁵ = 181875406613 is a prime.

It is a super-2 number, since 2×181875406645² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448732 + ... + 751738.

It is an arithmetic number, because the mean of its divisors is an integer number (27281628288).

Almost surely, 2^181875406645 is an apocalyptic number.

It is an amenable number.

181875406645 is a deficient number, since it is larger than the sum of its proper divisors (36377619659).

181875406645 is a wasteful number, since it uses less digits than its factorization.

181875406645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423059.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 181875406645 in words is "one hundred eighty-one billion, eight hundred seventy-five million, four hundred six thousand, six hundred forty-five".