66705571156 has 24 divisors (see below), whose sum is σ = 133882575680. Its totient is φ = 28487080512.

The previous prime is 66705571151. The next prime is 66705571181. The reversal of 66705571156 is 65117550766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66705571151) 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, 4201161 + ... + 4217008.

Almost surely, 2^66705571156 is an apocalyptic number.

It is an amenable number.

66705571156 is an abundant number, since it is smaller than the sum of its proper divisors (67177004524).

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

66705571156 is a wasteful number, since it uses less digits than its factorization.

66705571156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8418463 (or 8418461 counting only the distinct ones).

The product of its (nonzero) digits is 1323000, while the sum is 49.

The spelling of 66705571156 in words is "sixty-six billion, seven hundred five million, five hundred seventy-one thousand, one hundred fifty-six".