66109993007 has 2 divisors, whose sum is σ = 66109993008. Its totient is φ = 66109993006.

The previous prime is 66109992967. The next prime is 66109993009. The reversal of 66109993007 is 70039990166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66109993007 - 2¹² = 66109988911 is a prime.

Together with 66109993009, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66109993009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33054996503 + 33054996504.

It is an arithmetic number, because the mean of its divisors is an integer number (33054996504).

Almost surely, 2^66109993007 is an apocalyptic number.

66109993007 is a deficient number, since it is larger than the sum of its proper divisors (1).

66109993007 is an equidigital number, since it uses as much as digits as its factorization.

66109993007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 551124, while the sum is 50.

The spelling of 66109993007 in words is "sixty-six billion, one hundred nine million, nine hundred ninety-three thousand, seven".