66859250737 has 2 divisors, whose sum is σ = 66859250738. Its totient is φ = 66859250736.

The previous prime is 66859250729. The next prime is 66859250743. The reversal of 66859250737 is 73705295866.

66859250737 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., 50193473521 + 16665777216 = 224039^2 + 129096^2 .

It is a cyclic number.

It is not a de Polignac number, because 66859250737 - 2³ = 66859250729 is a prime.

It is a super-2 number, since 2×66859250737² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66859250707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33429625368 + 33429625369.

It is an arithmetic number, because the mean of its divisors is an integer number (33429625369).

Almost surely, 2^66859250737 is an apocalyptic number.

It is an amenable number.

66859250737 is a deficient number, since it is larger than the sum of its proper divisors (1).

66859250737 is an equidigital number, since it uses as much as digits as its factorization.

66859250737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 66859250737 in words is "sixty-six billion, eight hundred fifty-nine million, two hundred fifty thousand, seven hundred thirty-seven".