669441791141 has 4 divisors (see below), whose sum is σ = 669480722592. Its totient is φ = 669402859692.

The previous prime is 669441791069. The next prime is 669441791143. The reversal of 669441791141 is 141197144966.

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 an emirpimes, since its reverse is a distinct semiprime: 141197144966 = 2 ⋅70598572483.

It is a cyclic number.

It is not a de Polignac number, because 669441791141 - 2¹⁰ = 669441790117 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 (669441791143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19439921 + ... + 19474326.

It is an arithmetic number, because the mean of its divisors is an integer number (167370180648).

Almost surely, 2^669441791141 is an apocalyptic number.

It is an amenable number.

669441791141 is a deficient number, since it is larger than the sum of its proper divisors (38931451).

669441791141 is a wasteful number, since it uses less digits than its factorization.

669441791141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38931450.

The product of its digits is 1306368, while the sum is 53.

The spelling of 669441791141 in words is "six hundred sixty-nine billion, four hundred forty-one million, seven hundred ninety-one thousand, one hundred forty-one".