669737977 has 4 divisors (see below), whose sum is σ = 692832420. Its totient is φ = 646643536.

The previous prime is 669737951. The next prime is 669738007. The reversal of 669737977 is 779737966.

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

It can be written as a sum of positive squares in 2 ways, for example, as 426876921 + 242861056 = 20661^2 + 15584^2 .

It is a cyclic number.

It is not a de Polignac number, because 669737977 - 2¹¹ = 669735929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669737917) 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, 11547178 + ... + 11547235.

It is an arithmetic number, because the mean of its divisors is an integer number (173208105).

Almost surely, 2^669737977 is an apocalyptic number.

It is an amenable number.

669737977 is a deficient number, since it is larger than the sum of its proper divisors (23094443).

669737977 is a wasteful number, since it uses less digits than its factorization.

669737977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23094442.

The product of its digits is 21003948, while the sum is 61.

The square root of 669737977 is about 25879.2963003247. The cubic root of 669737977 is about 874.9199282374.

The spelling of 669737977 in words is "six hundred sixty-nine million, seven hundred thirty-seven thousand, nine hundred seventy-seven".