669191841 has 8 divisors (see below), whose sum is σ = 991395360. Its totient is φ = 446127876.

The previous prime is 669191807. The next prime is 669191863. The reversal of 669191841 is 148191966.

669191841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669191841 - 2¹¹ = 669189793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669191441) 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, 12392415 + ... + 12392468.

It is an arithmetic number, because the mean of its divisors is an integer number (123924420).

Almost surely, 2^669191841 is an apocalyptic number.

It is an amenable number.

669191841 is a deficient number, since it is larger than the sum of its proper divisors (322203519).

669191841 is a wasteful number, since it uses less digits than its factorization.

669191841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24784892 (or 24784886 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 669191841 is about 25868.7425477158. The cubic root of 669191841 is about 874.6820465456.

It can be divided in two parts, 669 and 191841, that added together give a triangular number (192510 = T₆₂₀).

The spelling of 669191841 in words is "six hundred sixty-nine million, one hundred ninety-one thousand, eight hundred forty-one".