66521073229 has 8 divisors (see below), whose sum is σ = 73304081312. Its totient is φ = 59976065520.

The previous prime is 66521073197. The next prime is 66521073239. The reversal of 66521073229 is 92237012566.

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

It is a cyclic number.

It is not a de Polignac number, because 66521073229 - 2⁵ = 66521073197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66521073239) 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, 59499507 + ... + 59500624.

It is an arithmetic number, because the mean of its divisors is an integer number (9163010164).

Almost surely, 2^66521073229 is an apocalyptic number.

It is an amenable number.

66521073229 is a deficient number, since it is larger than the sum of its proper divisors (6783008083).

66521073229 is a wasteful number, since it uses less digits than its factorization.

66521073229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119000187.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 66521073229 in words is "sixty-six billion, five hundred twenty-one million, seventy-three thousand, two hundred twenty-nine".