669897967790 has 8 divisors (see below), whose sum is σ = 1205816342040. Its totient is φ = 267959187112.

The previous prime is 669897967771. The next prime is 669897967793. The reversal of 669897967790 is 97769798966.

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

It is a junction number, because it is equal to n+sod(n) for n = 669897967699 and 669897967708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669897967793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33494898380 + ... + 33494898399.

It is an arithmetic number, because the mean of its divisors is an integer number (150727042755).

Almost surely, 2^669897967790 is an apocalyptic number.

669897967790 is a deficient number, since it is larger than the sum of its proper divisors (535918374250).

669897967790 is a wasteful number, since it uses less digits than its factorization.

669897967790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66989796786.

The product of its (nonzero) digits is 3888730944, while the sum is 83.

The spelling of 669897967790 in words is "six hundred sixty-nine billion, eight hundred ninety-seven million, nine hundred sixty-seven thousand, seven hundred ninety".