6651060521691 has 16 divisors (see below), whose sum is σ = 8871450285600. Its totient is φ = 4432355880960.

The previous prime is 6651060521687. The next prime is 6651060521701. The reversal of 6651060521691 is 1961250601566.

It is not a de Polignac number, because 6651060521691 - 2² = 6651060521687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6651060521691.

It is not an unprimeable number, because it can be changed into a prime (6651060521891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94240485 + ... + 94311033.

It is an arithmetic number, because the mean of its divisors is an integer number (554465642850).

Almost surely, 2^{6651060521691} is an apocalyptic number.

6651060521691 is a deficient number, since it is larger than the sum of its proper divisors (2220389763909).

6651060521691 is a wasteful number, since it uses less digits than its factorization.

6651060521691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82046.

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 6651060521691 in words is "six trillion, six hundred fifty-one billion, sixty million, five hundred twenty-one thousand, six hundred ninety-one".