66432664436 has 6 divisors (see below), whose sum is σ = 116257162770. Its totient is φ = 33216332216.

The previous prime is 66432664433. The next prime is 66432664483. The reversal of 66432664436 is 63446623466.

It can be written as a sum of positive squares in only one way, i.e., 66303160036 + 129504400 = 257494^2 + 11380^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66432664433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8304083051 + ... + 8304083058.

It is an arithmetic number, because the mean of its divisors is an integer number (19376193795).

Almost surely, 2^66432664436 is an apocalyptic number.

It is an amenable number.

66432664436 is a deficient number, since it is larger than the sum of its proper divisors (49824498334).

66432664436 is a wasteful number, since it uses less digits than its factorization.

66432664436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16608166113 (or 16608166111 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 50.

The spelling of 66432664436 in words is "sixty-six billion, four hundred thirty-two million, six hundred sixty-four thousand, four hundred thirty-six".