669516645 has 48 divisors (see below), whose sum is σ = 1272699648. Its totient is φ = 299537280.

The previous prime is 669516643. The next prime is 669516697. The reversal of 669516645 is 546615966.

It is not a de Polignac number, because 669516645 - 2¹ = 669516643 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669516594 and 669516603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669516643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24855 + ... + 44235.

It is an arithmetic number, because the mean of its divisors is an integer number (26514576).

Almost surely, 2^669516645 is an apocalyptic number.

It is an amenable number.

669516645 is a deficient number, since it is larger than the sum of its proper divisors (603183003).

669516645 is a wasteful number, since it uses less digits than its factorization.

669516645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19450 (or 19443 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 48.

The square root of 669516645 is about 25875.0197101374. The cubic root of 669516645 is about 874.8235377484.

The spelling of 669516645 in words is "six hundred sixty-nine million, five hundred sixteen thousand, six hundred forty-five".