66564012450 has 48 divisors (see below), whose sum is σ = 177777121536. Its totient is φ = 16384987200.

The previous prime is 66564012443. The next prime is 66564012461. The reversal of 66564012450 is 5421046566.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 66564012399 and 66564012408.

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, 17065746 + ... + 17069645.

It is an arithmetic number, because the mean of its divisors is an integer number (3703690032).

Almost surely, 2^66564012450 is an apocalyptic number.

66564012450 is an abundant number, since it is smaller than the sum of its proper divisors (111213109086).

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

66564012450 is a wasteful number, since it uses less digits than its factorization.

66564012450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34135419 (or 34135414 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 66564012450 in words is "sixty-six billion, five hundred sixty-four million, twelve thousand, four hundred fifty".