669961759 has 4 divisors (see below), whose sum is σ = 670013560. Its totient is φ = 669909960.

The previous prime is 669961757. The next prime is 669961763. The reversal of 669961759 is 957169966.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 669961759 - 2¹ = 669961757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669961753) 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, 11569 + ... + 38389.

It is an arithmetic number, because the mean of its divisors is an integer number (167503390).

Almost surely, 2^669961759 is an apocalyptic number.

669961759 is a deficient number, since it is larger than the sum of its proper divisors (51801).

669961759 is a wasteful number, since it uses less digits than its factorization.

669961759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51800.

The product of its digits is 5511240, while the sum is 58.

The square root of 669961759 is about 25883.6195111889. The cubic root of 669961759 is about 875.0173641180.

The spelling of 669961759 in words is "six hundred sixty-nine million, nine hundred sixty-one thousand, seven hundred fifty-nine".