665678876492 has 24 divisors (see below), whose sum is σ = 1331784508320. Its totient is φ = 285199499520.

The previous prime is 665678876407. The next prime is 665678876503. The reversal of 665678876492 is 294678876566.

It is a happy 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, 3721367 + ... + 3896142.

It is an arithmetic number, because the mean of its divisors is an integer number (55491021180).

Almost surely, 2^665678876492 is an apocalyptic number.

It is an amenable number.

665678876492 is an abundant number, since it is smaller than the sum of its proper divisors (666105631828).

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

665678876492 is a wasteful number, since it uses less digits than its factorization.

665678876492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7620641 (or 7620639 counting only the distinct ones).

The product of its digits is 1463132160, while the sum is 74.

Adding to 665678876492 its sum of digits (74), we get a palindrome (665678876566).

The spelling of 665678876492 in words is "six hundred sixty-five billion, six hundred seventy-eight million, eight hundred seventy-six thousand, four hundred ninety-two".