8534861661 has 4 divisors (see below), whose sum is σ = 11379815552. Its totient is φ = 5689907772.

The previous prime is 8534861653. The next prime is 8534861711. The reversal of 8534861661 is 1661684358.

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 not a de Polignac number, because 8534861661 - 2³ = 8534861653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8534861661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8534861641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1422476941 + ... + 1422476946.

It is an arithmetic number, because the mean of its divisors is an integer number (2844953888).

Almost surely, 2^8534861661 is an apocalyptic number.

It is an amenable number.

8534861661 is a deficient number, since it is larger than the sum of its proper divisors (2844953891).

8534861661 is a wasteful number, since it uses less digits than its factorization.

8534861661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844953890.

The product of its digits is 829440, while the sum is 48.

The square root of 8534861661 is about 92384.3150161325. The cubic root of 8534861661 is about 2043.6138095072.

The spelling of 8534861661 in words is "eight billion, five hundred thirty-four million, eight hundred sixty-one thousand, six hundred sixty-one".