6405136494 has 16 divisors (see below), whose sum is σ = 12814186368. Its totient is φ = 2134393272.

The previous prime is 6405136471. The next prime is 6405136511. The reversal of 6405136494 is 4946315046.

It is a happy number.

It is a super-2 number, since 2×6405136494² = 82051547013541224072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141562 + ... + 181245.

It is an arithmetic number, because the mean of its divisors is an integer number (800886648).

Almost surely, 2^6405136494 is an apocalyptic number.

6405136494 is an abundant number, since it is smaller than the sum of its proper divisors (6409049874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6405136494 is a wasteful number, since it uses less digits than its factorization.

6405136494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326119.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 6405136494 is about 80032.0966487821. The cubic root of 6405136494 is about 1857.1320983998.

The spelling of 6405136494 in words is "six billion, four hundred five million, one hundred thirty-six thousand, four hundred ninety-four".