66087730787663 has 16 divisors (see below), whose sum is σ = 73633094578176. Its totient is φ = 58902921623520.

The previous prime is 66087730787621. The next prime is 66087730787719. The reversal of 66087730787663 is 36678703778066.

It is not a de Polignac number, because 66087730787663 - 2⁶ = 66087730787599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66087730787963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184911095 + ... + 185268152.

It is an arithmetic number, because the mean of its divisors is an integer number (4602068411136).

Almost surely, 2^{66087730787663} is an apocalyptic number.

66087730787663 is a deficient number, since it is larger than the sum of its proper divisors (7545363790513).

66087730787663 is a wasteful number, since it uses less digits than its factorization.

66087730787663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370179734.

The product of its (nonzero) digits is 1792336896, while the sum is 74.

The spelling of 66087730787663 in words is "sixty-six trillion, eighty-seven billion, seven hundred thirty million, seven hundred eighty-seven thousand, six hundred sixty-three".