66464002044 has 72 divisors (see below), whose sum is σ = 186284170800. Its totient is φ = 19810425600.

The previous prime is 66464002001. The next prime is 66464002057. The reversal of 66464002044 is 44020046466.

It is a happy number.

66464002044 is a `hidden beast` number, since 6 + 6 + 4 + 640 + 0 + 2 + 0 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 1351569 + ... + 1399880.

It is an arithmetic number, because the mean of its divisors is an integer number (2587280150).

Almost surely, 2^66464002044 is an apocalyptic number.

It is an amenable number.

66464002044 is an abundant number, since it is smaller than the sum of its proper divisors (119820168756).

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

66464002044 is a wasteful number, since it uses less digits than its factorization.

66464002044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751531 (or 2751526 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The spelling of 66464002044 in words is "sixty-six billion, four hundred sixty-four million, two thousand, forty-four".