66902947927 has 2 divisors, whose sum is σ = 66902947928. Its totient is φ = 66902947926.

The previous prime is 66902947861. The next prime is 66902947931. The reversal of 66902947927 is 72974920966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66902947927 - 2⁷ = 66902947799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66902947997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33451473963 + 33451473964.

It is an arithmetic number, because the mean of its divisors is an integer number (33451473964).

Almost surely, 2^66902947927 is an apocalyptic number.

66902947927 is a deficient number, since it is larger than the sum of its proper divisors (1).

66902947927 is an equidigital number, since it uses as much as digits as its factorization.

66902947927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 61.

The spelling of 66902947927 in words is "sixty-six billion, nine hundred two million, nine hundred forty-seven thousand, nine hundred twenty-seven".