6650645877791 has 4 divisors (see below), whose sum is σ = 6651039354192. Its totient is φ = 6650252401392.

The previous prime is 6650645877779. The next prime is 6650645877797. The reversal of 6650645877791 is 1977785460566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6650645877791 - 2¹⁴ = 6650645861407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650645877797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196712846 + ... + 196746651.

It is an arithmetic number, because the mean of its divisors is an integer number (1662759838548).

Almost surely, 2^{6650645877791} is an apocalyptic number.

6650645877791 is a deficient number, since it is larger than the sum of its proper divisors (393476401).

6650645877791 is a wasteful number, since it uses less digits than its factorization.

6650645877791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393476400.

The product of its (nonzero) digits is 533433600, while the sum is 71.

The spelling of 6650645877791 in words is "six trillion, six hundred fifty billion, six hundred forty-five million, eight hundred seventy-seven thousand, seven hundred ninety-one".