66241644576 has 48 divisors (see below), whose sum is σ = 184112810784. Its totient is φ = 20781691904.

The previous prime is 66241644551. The next prime is 66241644577. The reversal of 66241644576 is 67544614266.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×66241644576² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (66241644577) 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, 20292990 + ... + 20296253.

It is an arithmetic number, because the mean of its divisors is an integer number (3835683558).

Almost surely, 2^66241644576 is an apocalyptic number.

It is an amenable number.

66241644576 is an abundant number, since it is smaller than the sum of its proper divisors (117871166208).

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

66241644576 is a wasteful number, since it uses less digits than its factorization.

66241644576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40589273 (or 40589265 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 51.

The spelling of 66241644576 in words is "sixty-six billion, two hundred forty-one million, six hundred forty-four thousand, five hundred seventy-six".