669992671 has 4 divisors (see below), whose sum is σ = 671789272. Its totient is φ = 668196072.

The previous prime is 669992647. The next prime is 669992689. The reversal of 669992671 is 176299966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176299966 = 2 ⋅88149983.

It is a cyclic number.

It is not a de Polignac number, because 669992671 - 2¹¹ = 669990623 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 (669992621) 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, 897741 + ... + 898486.

It is an arithmetic number, because the mean of its divisors is an integer number (167947318).

Almost surely, 2^669992671 is an apocalyptic number.

669992671 is a deficient number, since it is larger than the sum of its proper divisors (1796601).

669992671 is a wasteful number, since it uses less digits than its factorization.

669992671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796600.

The product of its digits is 2204496, while the sum is 55.

The square root of 669992671 is about 25884.2166387163. The cubic root of 669992671 is about 875.0308216626.

The spelling of 669992671 in words is "six hundred sixty-nine million, nine hundred ninety-two thousand, six hundred seventy-one".