66917840696 has 64 divisors (see below), whose sum is σ = 148241016000. Its totient is φ = 27722787840.

The previous prime is 66917840623. The next prime is 66917840699. The reversal of 66917840696 is 69604871966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66917840699) 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, 116570 + ... + 383958.

It is an arithmetic number, because the mean of its divisors is an integer number (2316265875).

Almost surely, 2^66917840696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66917840696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74120508000).

66917840696 is an abundant number, since it is smaller than the sum of its proper divisors (81323175304).

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

66917840696 is a wasteful number, since it uses less digits than its factorization.

66917840696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267552 (or 267548 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 66917840696 in words is "sixty-six billion, nine hundred seventeen million, eight hundred forty thousand, six hundred ninety-six".