66545603676 has 144 divisors (see below), whose sum is σ = 178735982880. Its totient is φ = 21406913280.

The previous prime is 66545603581. The next prime is 66545603699. The reversal of 66545603676 is 67630654566.

66545603676 is a `hidden beast` number, since 6 + 6 + 5 + 4 + 560 + 3 + 6 + 76 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17413846 + ... + 17417666.

Almost surely, 2^66545603676 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 66545603676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89367991440).

66545603676 is an abundant number, since it is smaller than the sum of its proper divisors (112190379204).

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

66545603676 is a wasteful number, since it uses less digits than its factorization.

66545603676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001 (or 3946 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 66545603676 in words is "sixty-six billion, five hundred forty-five million, six hundred three thousand, six hundred seventy-six".