6665565561498 has 80 divisors (see below), whose sum is σ = 15592223661696. Its totient is φ = 2124293260320.

The previous prime is 6665565561469. The next prime is 6665565561533. The reversal of 6665565561498 is 8941655655666.

It is a Curzon 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 39 ways as a sum of consecutive naturals, for example, 7872715 + ... + 8678177.

Almost surely, 2^{6665565561498} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6665565561498, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7796111830848).

6665565561498 is an abundant number, since it is smaller than the sum of its proper divisors (8926658100198).

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

6665565561498 is a wasteful number, since it uses less digits than its factorization.

6665565561498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807721 (or 807712 counting only the distinct ones).

The product of its digits is 1399680000, while the sum is 72.

The spelling of 6665565561498 in words is "six trillion, six hundred sixty-five billion, five hundred sixty-five million, five hundred sixty-one thousand, four hundred ninety-eight".