66256801656 has 16 divisors (see below), whose sum is σ = 165642004200. Its totient is φ = 22085600544.

The previous prime is 66256801651. The next prime is 66256801669. The reversal of 66256801656 is 65610865266.

It is a junction number, because it is equal to n+sod(n) for n = 66256801599 and 66256801608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66256801651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1380350011 + ... + 1380350058.

Almost surely, 2^66256801656 is an apocalyptic number.

It is an amenable number.

66256801656 is an abundant number, since it is smaller than the sum of its proper divisors (99385202544).

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

66256801656 is a wasteful number, since it uses less digits than its factorization.

66256801656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760700078 (or 2760700074 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 66256801656 in words is "sixty-six billion, two hundred fifty-six million, eight hundred one thousand, six hundred fifty-six".