6405939551 has 8 divisors (see below), whose sum is σ = 7002892800. Its totient is φ = 5811418840.

The previous prime is 6405939539. The next prime is 6405939557. The reversal of 6405939551 is 1559395046.

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 6405939551 - 2¹⁰ = 6405938527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6405939496 and 6405939505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6405939557) 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, 602621 + ... + 613158.

It is an arithmetic number, because the mean of its divisors is an integer number (875361600).

Almost surely, 2^6405939551 is an apocalyptic number.

6405939551 is a deficient number, since it is larger than the sum of its proper divisors (596953249).

6405939551 is a wasteful number, since it uses less digits than its factorization.

6405939551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216269.

The product of its (nonzero) digits is 729000, while the sum is 47.

The square root of 6405939551 is about 80037.1135848864. The cubic root of 6405939551 is about 1857.2097090595.

The spelling of 6405939551 in words is "six billion, four hundred five million, nine hundred thirty-nine thousand, five hundred fifty-one".