66637016436 has 24 divisors (see below), whose sum is σ = 155501022880. Its totient is φ = 22210245792.

The previous prime is 66637016351. The next prime is 66637016497. The reversal of 66637016436 is 63461073666.

66637016436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126166 + ... + 386253.

Almost surely, 2^66637016436 is an apocalyptic number.

It is an amenable number.

66637016436 is an abundant number, since it is smaller than the sum of its proper divisors (88864006444).

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

66637016436 is a wasteful number, since it uses less digits than its factorization.

66637016436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523263 (or 523261 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 48.

The spelling of 66637016436 in words is "sixty-six billion, six hundred thirty-seven million, sixteen thousand, four hundred thirty-six".