61066414331557 has 2 divisors, whose sum is σ = 61066414331558. Its totient is φ = 61066414331556.

The previous prime is 61066414331473. The next prime is 61066414331591. The reversal of 61066414331557 is 75513341466016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49914027180196 + 11152387151361 = 7064986^2 + 3339519^2 .

It is a cyclic number.

It is not a de Polignac number, because 61066414331557 - 2³⁹ = 60516658517669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61066414331957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30533207165778 + 30533207165779.

It is an arithmetic number, because the mean of its divisors is an integer number (30533207165779).

Almost surely, 2^{61066414331557} is an apocalyptic number.

It is an amenable number.

61066414331557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61066414331557 is an equidigital number, since it uses as much as digits as its factorization.

61066414331557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 61066414331557 in words is "sixty-one trillion, sixty-six billion, four hundred fourteen million, three hundred thirty-one thousand, five hundred fifty-seven".