6406549809 has 16 divisors (see below), whose sum is σ = 9321476544. Its totient is φ = 3881566400.

The previous prime is 6406549781. The next prime is 6406549811. The reversal of 6406549809 is 9089456046.

It is a cyclic number.

It is not a de Polignac number, because 6406549809 - 2⁵ = 6406549777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6406549109) 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, 86167 + ... + 142259.

It is an arithmetic number, because the mean of its divisors is an integer number (582592284).

Almost surely, 2^6406549809 is an apocalyptic number.

It is an amenable number.

6406549809 is a deficient number, since it is larger than the sum of its proper divisors (2914926735).

6406549809 is a wasteful number, since it uses less digits than its factorization.

6406549809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59568.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 6406549809 is about 80040.9258379737. The cubic root of 6406549809 is about 1857.2686825109.

The spelling of 6406549809 in words is "six billion, four hundred six million, five hundred forty-nine thousand, eight hundred nine".