66075311577631 has 2 divisors, whose sum is σ = 66075311577632. Its totient is φ = 66075311577630.

The previous prime is 66075311577571. The next prime is 66075311577637. The reversal of 66075311577631 is 13677511357066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66075311577631 is a prime.

It is a super-2 number, since 2×66075311577631² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66075311577637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33037655788815 + 33037655788816.

It is an arithmetic number, because the mean of its divisors is an integer number (33037655788816).

Almost surely, 2^{66075311577631} is an apocalyptic number.

66075311577631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66075311577631 is an equidigital number, since it uses as much as digits as its factorization.

66075311577631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16669800, while the sum is 58.

The spelling of 66075311577631 in words is "sixty-six trillion, seventy-five billion, three hundred eleven million, five hundred seventy-seven thousand, six hundred thirty-one".