669776677965 has 24 divisors (see below), whose sum is σ = 1160991456768. Its totient is φ = 357200316000.

The previous prime is 669776677937. The next prime is 669776678009. The reversal of 669776677965 is 569776677966.

It is a happy number.

It is not a de Polignac number, because 669776677965 - 2⁶ = 669776677901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 935340 + ... + 1488090.

It is an arithmetic number, because the mean of its divisors is an integer number (48374644032).

Almost surely, 2^669776677965 is an apocalyptic number.

It is an amenable number.

669776677965 is a deficient number, since it is larger than the sum of its proper divisors (491214778803).

669776677965 is a wasteful number, since it uses less digits than its factorization.

669776677965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579689 (or 579686 counting only the distinct ones).

The product of its digits is 7561421280, while the sum is 81.

Subtracting from 669776677965 its reverse (569776677966), we obtain a palindrome (99999999999).

The spelling of 669776677965 in words is "six hundred sixty-nine billion, seven hundred seventy-six million, six hundred seventy-seven thousand, nine hundred sixty-five".