78161880589 has 8 divisors (see below), whose sum is σ = 85327407032. Its totient is φ = 71161079040.

The previous prime is 78161880521. The next prime is 78161880607. The reversal of 78161880589 is 98508816187.

It can be written as a sum of positive squares in 4 ways, for example, as 23945086564 + 54216794025 = 154742^2 + 232845^2 .

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 78161880589 - 2⁹ = 78161880077 is a prime.

It is a super-2 number, since 2×78161880589² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78161880289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41180232 + ... + 41182129.

It is an arithmetic number, because the mean of its divisors is an integer number (10665925879).

Almost surely, 2^78161880589 is an apocalyptic number.

It is an amenable number.

78161880589 is a deficient number, since it is larger than the sum of its proper divisors (7165526443).

78161880589 is a wasteful number, since it uses less digits than its factorization.

78161880589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82362447.

The product of its (nonzero) digits is 7741440, while the sum is 61.

The spelling of 78161880589 in words is "seventy-eight billion, one hundred sixty-one million, eight hundred eighty thousand, five hundred eighty-nine".