669786897 has 8 divisors (see below), whose sum is σ = 961745344. Its totient is φ = 412176528.

The previous prime is 669786889. The next prime is 669786907. The reversal of 669786897 is 798687966.

It is a happy number.

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

It is not a de Polignac number, because 669786897 - 2³ = 669786889 is a prime.

It is a super-2 number, since 2×669786897² = 897228974785777218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669786847) 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, 8586973 + ... + 8587050.

It is an arithmetic number, because the mean of its divisors is an integer number (120218168).

Almost surely, 2^669786897 is an apocalyptic number.

It is an amenable number.

669786897 is a deficient number, since it is larger than the sum of its proper divisors (291958447).

669786897 is a wasteful number, since it uses less digits than its factorization.

669786897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17174039.

The product of its digits is 54867456, while the sum is 66.

The square root of 669786897 is about 25880.2414401412. The cubic root of 669786897 is about 874.9412301208.

The spelling of 669786897 in words is "six hundred sixty-nine million, seven hundred eighty-six thousand, eight hundred ninety-seven".