66615847511 has 2 divisors, whose sum is σ = 66615847512. Its totient is φ = 66615847510.

The previous prime is 66615847451. The next prime is 66615847553. The reversal of 66615847511 is 11574851666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66615847511 is a prime.

It is a super-2 number, since 2×66615847511² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66615847511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66615844511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33307923755 + 33307923756.

It is an arithmetic number, because the mean of its divisors is an integer number (33307923756).

Almost surely, 2^66615847511 is an apocalyptic number.

66615847511 is a deficient number, since it is larger than the sum of its proper divisors (1).

66615847511 is an equidigital number, since it uses as much as digits as its factorization.

66615847511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1209600, while the sum is 50.

The spelling of 66615847511 in words is "sixty-six billion, six hundred fifteen million, eight hundred forty-seven thousand, five hundred eleven".