8554513661 has 4 divisors (see below), whose sum is σ = 8619815424. Its totient is φ = 8489211900.

The previous prime is 8554513651. The next prime is 8554513673. The reversal of 8554513661 is 1663154558.

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 a cyclic number.

It is not a de Polignac number, because 8554513661 - 2²² = 8550319357 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 (8554513631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32650685 + ... + 32650946.

It is an arithmetic number, because the mean of its divisors is an integer number (2154953856).

Almost surely, 2^8554513661 is an apocalyptic number.

It is an amenable number.

8554513661 is a deficient number, since it is larger than the sum of its proper divisors (65301763).

8554513661 is a wasteful number, since it uses less digits than its factorization.

8554513661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65301762.

The product of its digits is 432000, while the sum is 44.

The square root of 8554513661 is about 92490.6139075744. The cubic root of 8554513661 is about 2045.1811191740.

The spelling of 8554513661 in words is "eight billion, five hundred fifty-four million, five hundred thirteen thousand, six hundred sixty-one".