181485026879 has 4 divisors (see below), whose sum is σ = 195445413576. Its totient is φ = 167524640184.

The previous prime is 181485026831. The next prime is 181485026909. The reversal of 181485026879 is 978620584181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978620584181 = 264029 ⋅3706489.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181485026879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181485026279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6980193329 + ... + 6980193354.

It is an arithmetic number, because the mean of its divisors is an integer number (48861353394).

Almost surely, 2^181485026879 is an apocalyptic number.

181485026879 is a deficient number, since it is larger than the sum of its proper divisors (13960386697).

181485026879 is a wasteful number, since it uses less digits than its factorization.

181485026879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13960386696.

The product of its (nonzero) digits is 7741440, while the sum is 59.

The spelling of 181485026879 in words is "one hundred eighty-one billion, four hundred eighty-five million, twenty-six thousand, eight hundred seventy-nine".