66998886699 has 16 divisors (see below), whose sum is σ = 89556446592. Its totient is φ = 44553757248.

The previous prime is 66998886683. The next prime is 66998886719. The reversal of 66998886699 is 99668889966.

It is not a de Polignac number, because 66998886699 - 2⁴ = 66998886683 is a prime.

66998886699 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66998886599) 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, 2137152 + ... + 2168274.

It is an arithmetic number, because the mean of its divisors is an integer number (5597277912).

Almost surely, 2^66998886699 is an apocalyptic number.

66998886699 is a deficient number, since it is larger than the sum of its proper divisors (22557559893).

66998886699 is a wasteful number, since it uses less digits than its factorization.

66998886699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32906.

The product of its digits is 4353564672, while the sum is 84.

The spelling of 66998886699 in words is "sixty-six billion, nine hundred ninety-eight million, eight hundred eighty-six thousand, six hundred ninety-nine".