66886880087 has 4 divisors (see below), whose sum is σ = 67042070496. Its totient is φ = 66731689680.

The previous prime is 66886880041. The next prime is 66886880117. The reversal of 66886880087 is 78008868866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66886880087 - 2²⁶ = 66819771223 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 (66886880017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77594558 + ... + 77595419.

It is an arithmetic number, because the mean of its divisors is an integer number (16760517624).

Almost surely, 2^66886880087 is an apocalyptic number.

66886880087 is a deficient number, since it is larger than the sum of its proper divisors (155190409).

66886880087 is a wasteful number, since it uses less digits than its factorization.

66886880087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155190408.

The product of its (nonzero) digits is 49545216, while the sum is 65.

The spelling of 66886880087 in words is "sixty-six billion, eight hundred eighty-six million, eight hundred eighty thousand, eighty-seven".