66051601656 has 64 divisors (see below), whose sum is σ = 166431283200. Its totient is φ = 21844137600.

The previous prime is 66051601631. The next prime is 66051601657. The reversal of 66051601656 is 65610615066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66051601657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1854625 + ... + 1889903.

It is an arithmetic number, because the mean of its divisors is an integer number (2600488800).

Almost surely, 2^66051601656 is an apocalyptic number.

It is an amenable number.

66051601656 is an abundant number, since it is smaller than the sum of its proper divisors (100379681544).

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

66051601656 is a wasteful number, since it uses less digits than its factorization.

66051601656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35900 (or 35896 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66051601656 in words is "sixty-six billion, fifty-one million, six hundred one thousand, six hundred fifty-six".