6665170216491 has 12 divisors (see below), whose sum is σ = 9627564272040. Its totient is φ = 4443402419520.

The previous prime is 6665170216487. The next prime is 6665170216559. The reversal of 6665170216491 is 1946120715666.

It is not a de Polignac number, because 6665170216491 - 2² = 6665170216487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665170216091) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2735145 + ... + 4561946.

It is an arithmetic number, because the mean of its divisors is an integer number (802297022670).

Almost surely, 2^{6665170216491} is an apocalyptic number.

6665170216491 is a deficient number, since it is larger than the sum of its proper divisors (2962394055549).

6665170216491 is a wasteful number, since it uses less digits than its factorization.

6665170216491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7398586 (or 7398583 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 6665170216491 in words is "six trillion, six hundred sixty-five billion, one hundred seventy million, two hundred sixteen thousand, four hundred ninety-one".