669081599 has 4 divisors (see below), whose sum is σ = 704296440. Its totient is φ = 633866760.

The previous prime is 669081577. The next prime is 669081607. The reversal of 669081599 is 995180966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669081599 - 2¹² = 669077503 is a prime.

It is a super-2 number, since 2×669081599² = 895340372240793602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669081599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669081199) 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, 17607392 + ... + 17607429.

It is an arithmetic number, because the mean of its divisors is an integer number (176074110).

Almost surely, 2^669081599 is an apocalyptic number.

669081599 is a deficient number, since it is larger than the sum of its proper divisors (35214841).

669081599 is a wasteful number, since it uses less digits than its factorization.

669081599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35214840.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 669081599 is about 25866.6116644604. The cubic root of 669081599 is about 874.6340124902.

The spelling of 669081599 in words is "six hundred sixty-nine million, eighty-one thousand, five hundred ninety-nine".