66249018422500 has 45 divisors (see below), whose sum is σ = 144874243448319. Its totient is φ = 26499444582000.

The previous prime is 66249018422437. The next prime is 66249018422501. The reversal of 66249018422500 is 522481094266.

The square root of 66249018422500 is 8139350.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 5193923044324 + 61055095378176 = 2279018^2 + 7813776^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66249018422501) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 406886107 + ... + 407048893.

Almost surely, 2^{66249018422500} is an apocalyptic number.

66249018422500 is the 8139350-th square number.

It is an amenable number.

66249018422500 is an abundant number, since it is smaller than the sum of its proper divisors (78625225025819).

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

66249018422500 is an frugal number, since it uses more digits than its factorization.

66249018422500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325598 (or 162794 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 66249018422500 in words is "sixty-six trillion, two hundred forty-nine billion, eighteen million, four hundred twenty-two thousand, five hundred".