669854837 has 4 divisors (see below), whose sum is σ = 669920160. Its totient is φ = 669789516.

The previous prime is 669854827. The next prime is 669854947. The reversal of 669854837 is 738458966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 669854837 - 2⁴ = 669854821 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 (669854827) 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, 13553 + ... + 39030.

It is an arithmetic number, because the mean of its divisors is an integer number (167480040).

Almost surely, 2^669854837 is an apocalyptic number.

It is an amenable number.

669854837 is a deficient number, since it is larger than the sum of its proper divisors (65323).

669854837 is a wasteful number, since it uses less digits than its factorization.

669854837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65322.

The product of its digits is 8709120, while the sum is 56.

The square root of 669854837 is about 25881.5539912116. The cubic root of 669854837 is about 874.9708124141.

The spelling of 669854837 in words is "six hundred sixty-nine million, eight hundred fifty-four thousand, eight hundred thirty-seven".