66225381509 has 8 divisors (see below), whose sum is σ = 80138276928. Its totient is φ = 53425517760.

The previous prime is 66225381503. The next prime is 66225381527. The reversal of 66225381509 is 90518352266.

66225381509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66225381509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66225381503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278257787 + ... + 278258024.

It is an arithmetic number, because the mean of its divisors is an integer number (10017284616).

Almost surely, 2^66225381509 is an apocalyptic number.

It is an amenable number.

66225381509 is a deficient number, since it is larger than the sum of its proper divisors (13912895419).

66225381509 is a wasteful number, since it uses less digits than its factorization.

66225381509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556515835.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 66225381509 in words is "sixty-six billion, two hundred twenty-five million, three hundred eighty-one thousand, five hundred nine".