6561350077 has 2 divisors, whose sum is σ = 6561350078. Its totient is φ = 6561350076.

The previous prime is 6561350063. The next prime is 6561350101. The reversal of 6561350077 is 7700531656.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5182416121 + 1378933956 = 71989^2 + 37134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6561350077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6561350017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280675038 + 3280675039.

It is an arithmetic number, because the mean of its divisors is an integer number (3280675039).

Almost surely, 2^6561350077 is an apocalyptic number.

It is an amenable number.

6561350077 is a deficient number, since it is larger than the sum of its proper divisors (1).

6561350077 is an equidigital number, since it uses as much as digits as its factorization.

6561350077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 6561350077 is about 81002.1609403107. The cubic root of 6561350077 is about 1872.1087364282.

The spelling of 6561350077 in words is "six billion, five hundred sixty-one million, three hundred fifty thousand, seventy-seven".