181602201577613 has 4 divisors (see below), whose sum is σ = 181614154610748. Its totient is φ = 181590248544480.

The previous prime is 181602201577607. The next prime is 181602201577633. The reversal of 181602201577613 is 316775102206181.

It is a happy number.

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 170624125408489 + 10978076169124 = 13062317^2 + 3313318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181602201577613 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 (181602201577603) 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 3 ways as a sum of consecutive naturals, for example, 5976493778 + ... + 5976524163.

It is an arithmetic number, because the mean of its divisors is an integer number (45403538652687).

Almost surely, 2^{181602201577613} is an apocalyptic number.

It is an amenable number.

181602201577613 is a deficient number, since it is larger than the sum of its proper divisors (11953033135).

181602201577613 is a wasteful number, since it uses less digits than its factorization.

181602201577613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11953033134.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 181602201577613 in words is "one hundred eighty-one trillion, six hundred two billion, two hundred one million, five hundred seventy-seven thousand, six hundred thirteen".