61897067257 has 2 divisors, whose sum is σ = 61897067258. Its totient is φ = 61897067256.

The previous prime is 61897067237. The next prime is 61897067333. The reversal of 61897067257 is 75276079816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60981339136 + 915728121 = 246944^2 + 30261^2 .

It is a cyclic number.

It is not a de Polignac number, because 61897067257 - 2¹⁵ = 61897034489 is a prime.

It is not a weakly prime, because it can be changed into another prime (61897067227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30948533628 + 30948533629.

It is an arithmetic number, because the mean of its divisors is an integer number (30948533629).

Almost surely, 2^61897067257 is an apocalyptic number.

It is an amenable number.

61897067257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61897067257 is an equidigital number, since it uses as much as digits as its factorization.

61897067257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8890560, while the sum is 58.

The spelling of 61897067257 in words is "sixty-one billion, eight hundred ninety-seven million, sixty-seven thousand, two hundred fifty-seven".