66544912450 has 24 divisors (see below), whose sum is σ = 124457385780. Its totient is φ = 26470900800.

The previous prime is 66544912411. The next prime is 66544912451. The reversal of 66544912450 is 5421944566.

66544912450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 5679581769 + 60865330681 = 75363^2 + 246709^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66544912450.

It is not an unprimeable number, because it can be changed into a prime (66544912451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3667465 + ... + 3685564.

Almost surely, 2^66544912450 is an apocalyptic number.

66544912450 is a deficient number, since it is larger than the sum of its proper divisors (57912473330).

66544912450 is a wasteful number, since it uses less digits than its factorization.

66544912450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7353222 (or 7353217 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 66544912450 in words is "sixty-six billion, five hundred forty-four million, nine hundred twelve thousand, four hundred fifty".