6816555901 has 8 divisors (see below), whose sum is σ = 6985528704. Its totient is φ = 6647712480.

The previous prime is 6816555899. The next prime is 6816555913. The reversal of 6816555901 is 1095556186.

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 6816555901 - 2¹ = 6816555899 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 (6816555961) 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, 79020 + ... + 140986.

It is an arithmetic number, because the mean of its divisors is an integer number (873191088).

Almost surely, 2^6816555901 is an apocalyptic number.

It is an amenable number.

6816555901 is a deficient number, since it is larger than the sum of its proper divisors (168972803).

6816555901 is a wasteful number, since it uses less digits than its factorization.

6816555901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64691.

The product of its (nonzero) digits is 324000, while the sum is 46.

The square root of 6816555901 is about 82562.4363799906. The cubic root of 6816555901 is about 1896.0727654195.

The spelling of 6816555901 in words is "six billion, eight hundred sixteen million, five hundred fifty-five thousand, nine hundred one".