66566647156 has 24 divisors (see below), whose sum is σ = 117527545856. Its totient is φ = 32987878560.

The previous prime is 66566647141. The next prime is 66566647157. The reversal of 66566647156 is 65174666566.

It is a super-2 number, since 2×66566647156² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66566647156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566647157) 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, 440761 + ... + 572191.

Almost surely, 2^66566647156 is an apocalyptic number.

It is an amenable number.

66566647156 is a deficient number, since it is larger than the sum of its proper divisors (50960898700).

66566647156 is a wasteful number, since it uses less digits than its factorization.

66566647156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132559 (or 132557 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 58.

The spelling of 66566647156 in words is "sixty-six billion, five hundred sixty-six million, six hundred forty-seven thousand, one hundred fifty-six".