66616650097 has 2 divisors, whose sum is σ = 66616650098. Its totient is φ = 66616650096.

The previous prime is 66616650083. The next prime is 66616650119. The reversal of 66616650097 is 79005661666.

66616650097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38400713521 + 28215936576 = 195961^2 + 167976^2 .

It is a cyclic number.

It is not a de Polignac number, because 66616650097 - 2³¹ = 64469166449 is a prime.

It is a super-2 number, since 2×66616650097² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66616650797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33308325048 + 33308325049.

It is an arithmetic number, because the mean of its divisors is an integer number (33308325049).

Almost surely, 2^66616650097 is an apocalyptic number.

It is an amenable number.

66616650097 is a deficient number, since it is larger than the sum of its proper divisors (1).

66616650097 is an equidigital number, since it uses as much as digits as its factorization.

66616650097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 66616650097 in words is "sixty-six billion, six hundred sixteen million, six hundred fifty thousand, ninety-seven".