718181880661 has 4 divisors (see below), whose sum is σ = 820779292192. Its totient is φ = 615584469132.

The previous prime is 718181880617. The next prime is 718181880667. The reversal of 718181880661 is 166088181817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 718181880661 - 2⁹ = 718181880149 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 (718181880667) 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, 51298705755 + ... + 51298705768.

It is an arithmetic number, because the mean of its divisors is an integer number (205194823048).

Almost surely, 2^718181880661 is an apocalyptic number.

It is an amenable number.

718181880661 is a deficient number, since it is larger than the sum of its proper divisors (102597411531).

718181880661 is a wasteful number, since it uses less digits than its factorization.

718181880661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102597411530.

The product of its (nonzero) digits is 1032192, while the sum is 55.

The spelling of 718181880661 in words is "seven hundred eighteen billion, one hundred eighty-one million, eight hundred eighty thousand, six hundred sixty-one".