66697937376 has 96 divisors (see below), whose sum is σ = 200280084480. Its totient is φ = 19038813696.

The previous prime is 66697937351. The next prime is 66697937393. The reversal of 66697937376 is 67373979666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×66697937376² (a number of 22 digits) contains 22 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66697937376.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684810 + ... + 776118.

It is an arithmetic number, because the mean of its divisors is an integer number (2086250880).

Almost surely, 2^66697937376 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 66697937376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100140042240).

66697937376 is an abundant number, since it is smaller than the sum of its proper divisors (133582147104).

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

66697937376 is a wasteful number, since it uses less digits than its factorization.

66697937376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92416 (or 92408 counting only the distinct ones).

The product of its digits is 324060912, while the sum is 69.

The spelling of 66697937376 in words is "sixty-six billion, six hundred ninety-seven million, nine hundred thirty-seven thousand, three hundred seventy-six".