8661779081 has 8 divisors (see below), whose sum is σ = 8730136800. Its totient is φ = 8593455520.

The previous prime is 8661779057. The next prime is 8661779107. The reversal of 8661779081 is 1809771668.

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 8661779081 - 2²² = 8657584777 is a prime.

It is a super-2 number, since 2×8661779081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8661779281) 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, 792230 + ... + 803088.

It is an arithmetic number, because the mean of its divisors is an integer number (1091267100).

Almost surely, 2^8661779081 is an apocalyptic number.

It is an amenable number.

8661779081 is a deficient number, since it is larger than the sum of its proper divisors (68357719).

8661779081 is a wasteful number, since it uses less digits than its factorization.

8661779081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17079.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 8661779081 is about 93068.6793771138. The cubic root of 8661779081 is about 2053.6938423242.

The spelling of 8661779081 in words is "eight billion, six hundred sixty-one million, seven hundred seventy-nine thousand, eighty-one".