66850958965 has 40 divisors (see below), whose sum is σ = 93998310840. Its totient is φ = 45638603136.

The previous prime is 66850958927. The next prime is 66850958987. The reversal of 66850958965 is 56985905866.

66850958965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 26115206404 + 40735752561 = 161602^2 + 201831^2 .

It is not a de Polignac number, because 66850958965 - 2¹¹ = 66850956917 is a prime.

It is a super-2 number, since 2×66850958965² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66850958965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2736987 + ... + 2761303.

It is an arithmetic number, because the mean of its divisors is an integer number (2349957771).

Almost surely, 2^66850958965 is an apocalyptic number.

It is an amenable number.

66850958965 is a deficient number, since it is larger than the sum of its proper divisors (27147351875).

66850958965 is an equidigital number, since it uses as much as digits as its factorization.

66850958965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24579 (or 24558 counting only the distinct ones).

The product of its (nonzero) digits is 139968000, while the sum is 67.

The spelling of 66850958965 in words is "sixty-six billion, eight hundred fifty million, nine hundred fifty-eight thousand, nine hundred sixty-five".