669477991975 has 12 divisors (see below), whose sum is σ = 894010611256. Its totient is φ = 494383747680.

The previous prime is 669477991957. The next prime is 669477991979. The reversal of 669477991975 is 579199774966.

It is not a de Polignac number, because 669477991975 - 2¹⁷ = 669477860903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 669477991895 and 669477991904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669477991979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1029965817 + ... + 1029966466.

Almost surely, 2^669477991975 is an apocalyptic number.

669477991975 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

669477991975 is a deficient number, since it is larger than the sum of its proper divisors (224532619281).

669477991975 is a wasteful number, since it uses less digits than its factorization.

669477991975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059932306 (or 2059932301 counting only the distinct ones).

The product of its digits is 1620304560, while the sum is 79.

The spelling of 669477991975 in words is "six hundred sixty-nine billion, four hundred seventy-seven million, nine hundred ninety-one thousand, nine hundred seventy-five".