6561372133 has 2 divisors, whose sum is σ = 6561372134. Its totient is φ = 6561372132.

The previous prime is 6561372131. The next prime is 6561372143. The reversal of 6561372133 is 3312731656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5175075844 + 1386296289 = 71938^2 + 37233^2 .

It is a cyclic number.

It is not a de Polignac number, because 6561372133 - 2¹ = 6561372131 is a prime.

Together with 6561372131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6561372092 and 6561372101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561372131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280686066 + 3280686067.

It is an arithmetic number, because the mean of its divisors is an integer number (3280686067).

Almost surely, 2^6561372133 is an apocalyptic number.

It is an amenable number.

6561372133 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561372133 is an equidigital number, since it uses as much as digits as its factorization.

6561372133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 37.

The square root of 6561372133 is about 81002.2970847124. The cubic root of 6561372133 is about 1872.1108341257.

The spelling of 6561372133 in words is "six billion, five hundred sixty-one million, three hundred seventy-two thousand, one hundred thirty-three".