66693211051 has 2 divisors, whose sum is σ = 66693211052. Its totient is φ = 66693211050.

The previous prime is 66693211049. The next prime is 66693211073. The reversal of 66693211051 is 15011239666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66693211051 - 2¹ = 66693211049 is a prime.

Together with 66693211049, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66693210995 and 66693211013.

It is not a weakly prime, because it can be changed into another prime (66693211031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33346605525 + 33346605526.

It is an arithmetic number, because the mean of its divisors is an integer number (33346605526).

Almost surely, 2^66693211051 is an apocalyptic number.

66693211051 is a deficient number, since it is larger than the sum of its proper divisors (1).

66693211051 is an equidigital number, since it uses as much as digits as its factorization.

66693211051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 66693211051 in words is "sixty-six billion, six hundred ninety-three million, two hundred eleven thousand, fifty-one".