669887105640 has 32 divisors (see below), whose sum is σ = 2009661317280. Its totient is φ = 178636561472.

The previous prime is 669887105639. The next prime is 669887105687. The reversal of 669887105640 is 46501788966.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2791196154 + ... + 2791196393.

It is an arithmetic number, because the mean of its divisors is an integer number (62801916165).

Almost surely, 2^669887105640 is an apocalyptic number.

669887105640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669887105640 is an abundant number, since it is smaller than the sum of its proper divisors (1339774211640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669887105640 is a wasteful number, since it uses less digits than its factorization.

669887105640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582392561 (or 5582392557 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 669887105640 in words is "six hundred sixty-nine billion, eight hundred eighty-seven million, one hundred five thousand, six hundred forty".