6406937517 has 4 divisors (see below), whose sum is σ = 8542583360. Its totient is φ = 4271291676.

The previous prime is 6406937507. The next prime is 6406937561. The reversal of 6406937517 is 7157396046.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6406937517 - 2²⁶ = 6339828653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6406937507) 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, 1067822917 + ... + 1067822922.

It is an arithmetic number, because the mean of its divisors is an integer number (2135645840).

Almost surely, 2^6406937517 is an apocalyptic number.

It is an amenable number.

6406937517 is a deficient number, since it is larger than the sum of its proper divisors (2135645843).

6406937517 is a wasteful number, since it uses less digits than its factorization.

6406937517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135645842.

The product of its (nonzero) digits is 952560, while the sum is 48.

The square root of 6406937517 is about 80043.3477373354. The cubic root of 6406937517 is about 1857.3061474712.

The spelling of 6406937517 in words is "six billion, four hundred six million, nine hundred thirty-seven thousand, five hundred seventeen".