9181868088661 has 8 divisors (see below), whose sum is σ = 9204485028440. Its totient is φ = 9159251966208.

The previous prime is 9181868088619. The next prime is 9181868088719. The reversal of 9181868088661 is 1668808681819.

It can be written as a sum of positive squares in 4 ways, for example, as 4019002515025 + 5162865573636 = 2004745^2 + 2272194^2 .

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 9181868088661 - 2²¹ = 9181865991509 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 (9181868088461) 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, 26616895 + ... + 26959651.

It is an arithmetic number, because the mean of its divisors is an integer number (1150560628555).

Almost surely, 2^{9181868088661} is an apocalyptic number.

It is an amenable number.

9181868088661 is a deficient number, since it is larger than the sum of its proper divisors (22616939779).

9181868088661 is a wasteful number, since it uses less digits than its factorization.

9181868088661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408663.

The product of its (nonzero) digits is 63700992, while the sum is 70.

The spelling of 9181868088661 in words is "nine trillion, one hundred eighty-one billion, eight hundred sixty-eight million, eighty-eight thousand, six hundred sixty-one".