61257555308063 has 2 divisors, whose sum is σ = 61257555308064. Its totient is φ = 61257555308062.

The previous prime is 61257555308057. The next prime is 61257555308129. The reversal of 61257555308063 is 36080355575216.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61257555308063 - 2²⁴ = 61257538530847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61257555302063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30628777654031 + 30628777654032.

It is an arithmetic number, because the mean of its divisors is an integer number (30628777654032).

Almost surely, 2^{61257555308063} is an apocalyptic number.

61257555308063 is a deficient number, since it is larger than the sum of its proper divisors (1).

61257555308063 is an equidigital number, since it uses as much as digits as its factorization.

61257555308063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680000, while the sum is 56.

The spelling of 61257555308063 in words is "sixty-one trillion, two hundred fifty-seven billion, five hundred fifty-five million, three hundred eight thousand, sixty-three".