6506921820971 has 16 divisors (see below), whose sum is σ = 7644594582240. Its totient is φ = 5460283249920.

The previous prime is 6506921820941. The next prime is 6506921821033. The reversal of 6506921820971 is 1790281296056.

It is a cyclic number.

It is not a de Polignac number, because 6506921820971 - 2⁶ = 6506921820907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6506921820941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12816761 + ... + 13314773.

It is an arithmetic number, because the mean of its divisors is an integer number (477787161390).

Almost surely, 2^{6506921820971} is an apocalyptic number.

6506921820971 is a deficient number, since it is larger than the sum of its proper divisors (1137672761269).

6506921820971 is a wasteful number, since it uses less digits than its factorization.

6506921820971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589406.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 6506921820971 in words is "six trillion, five hundred six billion, nine hundred twenty-one million, eight hundred twenty thousand, nine hundred seventy-one".