6405166771 has 4 divisors (see below), whose sum is σ = 6410176000. Its totient is φ = 6400157544.

The previous prime is 6405166769. The next prime is 6405166777. The reversal of 6405166771 is 1776615046.

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 6405166771 - 2¹ = 6405166769 is a prime.

It is a super-2 number, since 2×6405166771² = 82052322728645132882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6405166777) 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, 2502696 + ... + 2505253.

It is an arithmetic number, because the mean of its divisors is an integer number (1602544000).

Almost surely, 2^6405166771 is an apocalyptic number.

6405166771 is a deficient number, since it is larger than the sum of its proper divisors (5009229).

6405166771 is a wasteful number, since it uses less digits than its factorization.

6405166771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009228.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 6405166771 is about 80032.2858039179. The cubic root of 6405166771 is about 1857.1350246086.

The spelling of 6405166771 in words is "six billion, four hundred five million, one hundred sixty-six thousand, seven hundred seventy-one".