6557681633 has 4 divisors (see below), whose sum is σ = 6560331540. Its totient is φ = 6555031728.

The previous prime is 6557681621. The next prime is 6557681651. The reversal of 6557681633 is 3361867556.

6557681633 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4974198784 + 1583482849 = 70528^2 + 39793^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557681633 - 2⁴ = 6557681617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6557681833) 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, 1321238 + ... + 1326191.

It is an arithmetic number, because the mean of its divisors is an integer number (1640082885).

Almost surely, 2^6557681633 is an apocalyptic number.

It is an amenable number.

6557681633 is a deficient number, since it is larger than the sum of its proper divisors (2649907).

6557681633 is a wasteful number, since it uses less digits than its factorization.

6557681633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649906.

The product of its digits is 2721600, while the sum is 50.

The square root of 6557681633 is about 80979.5136624072. The cubic root of 6557681633 is about 1871.7597733697.

The spelling of 6557681633 in words is "six billion, five hundred fifty-seven million, six hundred eighty-one thousand, six hundred thirty-three".