66733335540 has 72 divisors (see below), whose sum is σ = 209921668320. Its totient is φ = 17795554848.

The previous prime is 66733335517. The next prime is 66733335563. The reversal of 66733335540 is 4553333766.

66733335540 is a `hidden beast` number, since 6 + 6 + 73 + 3 + 3 + 35 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (66733335517) and next prime (66733335563).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6860710 + ... + 6870429.

Almost surely, 2^66733335540 is an apocalyptic number.

66733335540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66733335540 is an abundant number, since it is smaller than the sum of its proper divisors (143188332780).

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

66733335540 is a wasteful number, since it uses less digits than its factorization.

66733335540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13731163 (or 13731149 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 45.

The spelling of 66733335540 in words is "sixty-six billion, seven hundred thirty-three million, three hundred thirty-five thousand, five hundred forty".