66697610087 has 2 divisors, whose sum is σ = 66697610088. Its totient is φ = 66697610086.

The previous prime is 66697610027. The next prime is 66697610099. The reversal of 66697610087 is 78001679666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66697610087 - 2¹² = 66697605991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66697610027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33348805043 + 33348805044.

It is an arithmetic number, because the mean of its divisors is an integer number (33348805044).

Almost surely, 2^66697610087 is an apocalyptic number.

66697610087 is a deficient number, since it is larger than the sum of its proper divisors (1).

66697610087 is an equidigital number, since it uses as much as digits as its factorization.

66697610087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 66697610087 in words is "sixty-six billion, six hundred ninety-seven million, six hundred ten thousand, eighty-seven".