669581943 has 8 divisors (see below), whose sum is σ = 892909056. Its totient is φ = 446321400.

The previous prime is 669581929. The next prime is 669581951. The reversal of 669581943 is 349185966.

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

It is not a de Polignac number, because 669581943 - 2⁶ = 669581879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669581903) 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, 15948 + ... + 39918.

It is an arithmetic number, because the mean of its divisors is an integer number (111613632).

Almost surely, 2^669581943 is an apocalyptic number.

669581943 is a deficient number, since it is larger than the sum of its proper divisors (223327113).

669581943 is a wasteful number, since it uses less digits than its factorization.

669581943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33285.

The product of its digits is 1399680, while the sum is 51.

The square root of 669581943 is about 25876.2814755134. The cubic root of 669581943 is about 874.8519773552.

The spelling of 669581943 in words is "six hundred sixty-nine million, five hundred eighty-one thousand, nine hundred forty-three".