61310210257 has 2 divisors, whose sum is σ = 61310210258. Its totient is φ = 61310210256.

The previous prime is 61310210197. The next prime is 61310210279. The reversal of 61310210257 is 75201201316.

It is a happy number.

61310210257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60710988816 + 599221441 = 246396^2 + 24479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61310210257 is a prime.

It is not a weakly prime, because it can be changed into another prime (61310210557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655105128 + 30655105129.

It is an arithmetic number, because the mean of its divisors is an integer number (30655105129).

Almost surely, 2^61310210257 is an apocalyptic number.

It is an amenable number.

61310210257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310210257 is an equidigital number, since it uses as much as digits as its factorization.

61310210257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The spelling of 61310210257 in words is "sixty-one billion, three hundred ten million, two hundred ten thousand, two hundred fifty-seven".