66457004440 has 32 divisors (see below), whose sum is σ = 149556401280. Its totient is φ = 26577798912.

The previous prime is 66457004423. The next prime is 66457004459. The reversal of 66457004440 is 4440075466.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 66457004393 and 66457004402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62644 + ... + 369916.

It is an arithmetic number, because the mean of its divisors is an integer number (4673637540).

Almost surely, 2^66457004440 is an apocalyptic number.

It is an amenable number.

66457004440 is an abundant number, since it is smaller than the sum of its proper divisors (83099396840).

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

66457004440 is a wasteful number, since it uses less digits than its factorization.

66457004440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312691 (or 312687 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The spelling of 66457004440 in words is "sixty-six billion, four hundred fifty-seven million, four thousand, four hundred forty".