8665543961 has 2 divisors, whose sum is σ = 8665543962. Its totient is φ = 8665543960.

The previous prime is 8665543933. The next prime is 8665543973. The reversal of 8665543961 is 1693455668.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8652720400 + 12823561 = 93020^2 + 3581^2 .

It is a cyclic number.

It is not a de Polignac number, because 8665543961 - 2⁶ = 8665543897 is a prime.

It is not a weakly prime, because it can be changed into another prime (8665543981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4332771980 + 4332771981.

It is an arithmetic number, because the mean of its divisors is an integer number (4332771981).

Almost surely, 2^8665543961 is an apocalyptic number.

It is an amenable number.

8665543961 is a deficient number, since it is larger than the sum of its proper divisors (1).

8665543961 is an equidigital number, since it uses as much as digits as its factorization.

8665543961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 53.

The square root of 8665543961 is about 93088.9035331279. The cubic root of 8665543961 is about 2053.9913482151.

The spelling of 8665543961 in words is "eight billion, six hundred sixty-five million, five hundred forty-three thousand, nine hundred sixty-one".