61235307257 has 2 divisors, whose sum is σ = 61235307258. Its totient is φ = 61235307256.

The previous prime is 61235307241. The next prime is 61235307293. The reversal of 61235307257 is 75270353216.

61235307257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43554020416 + 17681286841 = 208696^2 + 132971^2 .

It is a cyclic number.

It is not a de Polignac number, because 61235307257 - 2⁴ = 61235307241 is a prime.

It is not a weakly prime, because it can be changed into another prime (61235307457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30617653628 + 30617653629.

It is an arithmetic number, because the mean of its divisors is an integer number (30617653629).

Almost surely, 2^61235307257 is an apocalyptic number.

It is an amenable number.

61235307257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61235307257 is an equidigital number, since it uses as much as digits as its factorization.

61235307257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264600, while the sum is 41.

The spelling of 61235307257 in words is "sixty-one billion, two hundred thirty-five million, three hundred seven thousand, two hundred fifty-seven".