66890039696 has 40 divisors (see below), whose sum is σ = 134300880384. Its totient is φ = 32240148480.

The previous prime is 66890039693. The next prime is 66890039779. The reversal of 66890039696 is 69693009866.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (66890039693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134900 + ... + 389843.

Almost surely, 2^66890039696 is an apocalyptic number.

It is an amenable number.

66890039696 is an abundant number, since it is smaller than the sum of its proper divisors (67410840688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66890039696 is a wasteful number, since it uses less digits than its factorization.

66890039696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525039 (or 525033 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 62.

The spelling of 66890039696 in words is "sixty-six billion, eight hundred ninety million, thirty-nine thousand, six hundred ninety-six".