66990083 has 4 divisors (see below), whose sum is σ = 67143120. Its totient is φ = 66837048.

The previous prime is 66990071. The next prime is 66990089. The reversal of 66990083 is 38009966.

66990083 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38009966 = 2 ⋅19004983.

It is a cyclic number.

It is not a de Polignac number, because 66990083 - 2²⁰ = 65941507 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66990083.

It is not an unprimeable number, because it can be changed into a prime (66990089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75860 + ... + 76737.

It is an arithmetic number, because the mean of its divisors is an integer number (16785780).

Almost surely, 2^66990083 is an apocalyptic number.

66990083 is a deficient number, since it is larger than the sum of its proper divisors (153037).

66990083 is a wasteful number, since it uses less digits than its factorization.

66990083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153036.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 66990083 is about 8184.7469722649. The cubic root of 66990083 is about 406.1347700645.

The spelling of 66990083 in words is "sixty-six million, nine hundred ninety thousand, eighty-three".