66115610087 has 2 divisors, whose sum is σ = 66115610088. Its totient is φ = 66115610086.

The previous prime is 66115610059. The next prime is 66115610149. The reversal of 66115610087 is 78001651166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66115610087 - 2¹⁴ = 66115593703 is a prime.

It is a super-2 number, since 2×66115610087² (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 (66115610887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33057805043 + 33057805044.

It is an arithmetic number, because the mean of its divisors is an integer number (33057805044).

Almost surely, 2^66115610087 is an apocalyptic number.

66115610087 is a deficient number, since it is larger than the sum of its proper divisors (1).

66115610087 is an equidigital number, since it uses as much as digits as its factorization.

66115610087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 66115610087 in words is "sixty-six billion, one hundred fifteen million, six hundred ten thousand, eighty-seven".