66433624521 has 16 divisors (see below), whose sum is σ = 96653875968. Its totient is φ = 40253157200.

The previous prime is 66433624483. The next prime is 66433624549. The reversal of 66433624521 is 12542633466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66433624521 - 2¹¹ = 66433622473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66433624021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100071 + ... + 377996.

It is an arithmetic number, because the mean of its divisors is an integer number (6040867248).

Almost surely, 2^66433624521 is an apocalyptic number.

It is an amenable number.

66433624521 is a deficient number, since it is larger than the sum of its proper divisors (30220251447).

66433624521 is a wasteful number, since it uses less digits than its factorization.

66433624521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482292.

The product of its digits is 622080, while the sum is 42.

The spelling of 66433624521 in words is "sixty-six billion, four hundred thirty-three million, six hundred twenty-four thousand, five hundred twenty-one".