6806217557 has 8 divisors (see below), whose sum is σ = 6923725752. Its totient is φ = 6688900800.

The previous prime is 6806217503. The next prime is 6806217559. The reversal of 6806217557 is 7557126086.

It can be written as a sum of positive squares in 4 ways, for example, as 2398452676 + 4407764881 = 48974^2 + 66391^2 .

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 6806217557 - 2¹⁰ = 6806216533 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 (6806217559) 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, 24803 + ... + 119279.

It is an arithmetic number, because the mean of its divisors is an integer number (865465719).

Almost surely, 2^6806217557 is an apocalyptic number.

It is an amenable number.

6806217557 is a deficient number, since it is larger than the sum of its proper divisors (117508195).

6806217557 is a wasteful number, since it uses less digits than its factorization.

6806217557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95719.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 6806217557 is about 82499.8033755233. The cubic root of 6806217557 is about 1895.1137194793.

The spelling of 6806217557 in words is "six billion, eight hundred six million, two hundred seventeen thousand, five hundred fifty-seven".