181232012765 has 4 divisors (see below), whose sum is σ = 217478415324. Its totient is φ = 144985610208.

The previous prime is 181232012747. The next prime is 181232012771. The reversal of 181232012765 is 567210232181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79283354329 + 101948658436 = 281573^2 + 319294^2 .

It is a cyclic number.

It is not a de Polignac number, because 181232012765 - 2¹⁶ = 181231947229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18123201272 + ... + 18123201281.

It is an arithmetic number, because the mean of its divisors is an integer number (54369603831).

Almost surely, 2^181232012765 is an apocalyptic number.

It is an amenable number.

181232012765 is a deficient number, since it is larger than the sum of its proper divisors (36246402559).

181232012765 is an equidigital number, since it uses as much as digits as its factorization.

181232012765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36246402558.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 181232012765 in words is "one hundred eighty-one billion, two hundred thirty-two million, twelve thousand, seven hundred sixty-five".