66651066631 has 2 divisors, whose sum is σ = 66651066632. Its totient is φ = 66651066630.

The previous prime is 66651066593. The next prime is 66651066641. The reversal of 66651066631 is 13666015666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66651066631 - 2³⁵ = 32291328263 is a prime.

It is a super-2 number, since 2×66651066631² (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 (66651066641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33325533315 + 33325533316.

It is an arithmetic number, because the mean of its divisors is an integer number (33325533316).

Almost surely, 2^66651066631 is an apocalyptic number.

66651066631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66651066631 is an equidigital number, since it uses as much as digits as its factorization.

66651066631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 46.

It can be divided in two parts, 6665 and 1066631, that added together give a square (1073296 = 1036²).

The spelling of 66651066631 in words is "sixty-six billion, six hundred fifty-one million, sixty-six thousand, six hundred thirty-one".