6405139577 has 8 divisors (see below), whose sum is σ = 6438458880. Its totient is φ = 6371861760.

The previous prime is 6405139541. The next prime is 6405139579. The reversal of 6405139577 is 7759315046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6405139577 - 2¹⁸ = 6404877433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6405139579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327449 + ... + 346457.

It is an arithmetic number, because the mean of its divisors is an integer number (804807360).

Almost surely, 2^6405139577 is an apocalyptic number.

It is an amenable number.

6405139577 is a deficient number, since it is larger than the sum of its proper divisors (33319303).

6405139577 is a wasteful number, since it uses less digits than its factorization.

6405139577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20743.

The product of its (nonzero) digits is 793800, while the sum is 47.

The square root of 6405139577 is about 80032.1159098021. The cubic root of 6405139577 is about 1857.1323963657.

The spelling of 6405139577 in words is "six billion, four hundred five million, one hundred thirty-nine thousand, five hundred seventy-seven".