181973793475 has 12 divisors (see below), whose sum is σ = 225763340400. Its totient is φ = 145504301600.

The previous prime is 181973793473. The next prime is 181973793479. The reversal of 181973793475 is 574397379181.

It is not a de Polignac number, because 181973793475 - 2¹ = 181973793473 is a prime.

It is a super-2 number, since 2×181973793475² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181973793473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1818631 + ... + 1916080.

It is an arithmetic number, because the mean of its divisors is an integer number (18813611700).

Almost surely, 2^181973793475 is an apocalyptic number.

181973793475 is a deficient number, since it is larger than the sum of its proper divisors (43789546925).

181973793475 is a wasteful number, since it uses less digits than its factorization.

181973793475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736670 (or 3736665 counting only the distinct ones).

The product of its digits is 40007520, while the sum is 64.

The spelling of 181973793475 in words is "one hundred eighty-one billion, nine hundred seventy-three million, seven hundred ninety-three thousand, four hundred seventy-five".