8661209601 has 16 divisors (see below), whose sum is σ = 12611556288. Its totient is φ = 5243620800.

The previous prime is 8661209549. The next prime is 8661209621. The reversal of 8661209601 is 1069021668.

It is not a de Polignac number, because 8661209601 - 2⁶ = 8661209537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8661209601.

It is not an unprimeable number, because it can be changed into a prime (8661209621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108406 + ... + 170511.

It is an arithmetic number, because the mean of its divisors is an integer number (788222268).

Almost surely, 2^8661209601 is an apocalyptic number.

It is an amenable number.

8661209601 is a deficient number, since it is larger than the sum of its proper divisors (3950346687).

8661209601 is a wasteful number, since it uses less digits than its factorization.

8661209601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279872.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 8661209601 is about 93065.6198657700. The cubic root of 8661209601 is about 2053.6488337414.

The spelling of 8661209601 in words is "eight billion, six hundred sixty-one million, two hundred nine thousand, six hundred one".