669349943965 has 8 divisors (see below), whose sum is σ = 803229343488. Its totient is φ = 535473681360.

The previous prime is 669349943881. The next prime is 669349943993. The reversal of 669349943965 is 569349943966.

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

It is not a de Polignac number, because 669349943965 - 2¹³ = 669349935773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 286021 + ... + 1191850.

It is an arithmetic number, because the mean of its divisors is an integer number (100403667936).

Almost surely, 2^669349943965 is an apocalyptic number.

It is an amenable number.

669349943965 is a deficient number, since it is larger than the sum of its proper divisors (133879399523).

669349943965 is a wasteful number, since it uses less digits than its factorization.

669349943965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568459.

The product of its digits is 1020366720, while the sum is 73.

Subtracting from 669349943965 its reverse (569349943966), we obtain a palindrome (99999999999).

The spelling of 669349943965 in words is "six hundred sixty-nine billion, three hundred forty-nine million, nine hundred forty-three thousand, nine hundred sixty-five".