66645323136 has 192 divisors, whose sum is σ = 222180210720. Its totient is φ = 18780512256.

The previous prime is 66645323111. The next prime is 66645323161. The reversal of 66645323136 is 63132354666.

66645323136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66645323111) and next prime (66645323161).

It is a tau number, because it is divible by the number of its divisors (192).

It is a junction number, because it is equal to n+sod(n) for n = 66645323091 and 66645323100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 532066 + ... + 645278.

Almost surely, 2^66645323136 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 66645323136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111090105360).

66645323136 is an abundant number, since it is smaller than the sum of its proper divisors (155534887584).

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

66645323136 is a wasteful number, since it uses less digits than its factorization.

66645323136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113313 (or 113298 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 45.

The spelling of 66645323136 in words is "sixty-six billion, six hundred forty-five million, three hundred twenty-three thousand, one hundred thirty-six".