66990579 has 8 divisors (see below), whose sum is σ = 89399952. Its totient is φ = 44620800.

The previous prime is 66990577. The next prime is 66990587. The reversal of 66990579 is 97509966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66990579 - 2¹ = 66990577 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66990577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5694 + ... + 12899.

It is an arithmetic number, because the mean of its divisors is an integer number (11174994).

Almost surely, 2^66990579 is an apocalyptic number.

66990579 is a deficient number, since it is larger than the sum of its proper divisors (22409373).

66990579 is a wasteful number, since it uses less digits than its factorization.

66990579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19797.

The product of its (nonzero) digits is 918540, while the sum is 51.

The square root of 66990579 is about 8184.7772724736. Note that the first 3 decimals coincide. The cubic root of 66990579 is about 406.1357724136.

The spelling of 66990579 in words is "sixty-six million, nine hundred ninety thousand, five hundred seventy-nine".