6406985892771 has 24 divisors (see below), whose sum is σ = 9321730549040. Its totient is φ = 4240314743616.

The previous prime is 6406985892763. The next prime is 6406985892799. The reversal of 6406985892771 is 1772985896046.

It is not a de Polignac number, because 6406985892771 - 2³ = 6406985892763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6406985892771.

It is not an unprimeable number, because it can be changed into a prime (6406985892731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19700841 + ... + 20023413.

Almost surely, 2^{6406985892771} is an apocalyptic number.

6406985892771 is a deficient number, since it is larger than the sum of its proper divisors (2914744656269).

6406985892771 is a wasteful number, since it uses less digits than its factorization.

6406985892771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338595 (or 338592 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 72.

The spelling of 6406985892771 in words is "six trillion, four hundred six billion, nine hundred eighty-five million, eight hundred ninety-two thousand, seven hundred seventy-one".