7666661533 has 4 divisors (see below), whose sum is σ = 7693945308. Its totient is φ = 7639377760.

The previous prime is 7666661501. The next prime is 7666661539. The reversal of 7666661533 is 3351666667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3351666667 = 307 ⋅10917481.

It can be written as a sum of positive squares in 2 ways, for example, as 2160576324 + 5506085209 = 46482^2 + 74203^2 .

It is a cyclic number.

It is not a de Polignac number, because 7666661533 - 2⁵ = 7666661501 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7666661539) 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, 13641466 + ... + 13642027.

It is an arithmetic number, because the mean of its divisors is an integer number (1923486327).

Almost surely, 2^7666661533 is an apocalyptic number.

It is an amenable number.

7666661533 is a deficient number, since it is larger than the sum of its proper divisors (27283775).

7666661533 is a wasteful number, since it uses less digits than its factorization.

7666661533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27283774.

The product of its digits is 2449440, while the sum is 49.

The square root of 7666661533 is about 87559.4742617839. The cubic root of 7666661533 is about 1971.8267931159.

The spelling of 7666661533 in words is "seven billion, six hundred sixty-six million, six hundred sixty-one thousand, five hundred thirty-three".