66189951007 has 2 divisors, whose sum is σ = 66189951008. Its totient is φ = 66189951006.

The previous prime is 66189950977. The next prime is 66189951031. The reversal of 66189951007 is 70015998166.

66189951007 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66189951007 is a prime.

It is a super-2 number, since 2×66189951007² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66189957007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33094975503 + 33094975504.

It is an arithmetic number, because the mean of its divisors is an integer number (33094975504).

Almost surely, 2^66189951007 is an apocalyptic number.

66189951007 is a deficient number, since it is larger than the sum of its proper divisors (1).

66189951007 is an equidigital number, since it uses as much as digits as its factorization.

66189951007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The spelling of 66189951007 in words is "sixty-six billion, one hundred eighty-nine million, nine hundred fifty-one thousand, seven".