651665606566156 has 96 divisors (see below), whose sum is σ = 1418227518879360. Its totient is φ = 255113425649664.

The previous prime is 651665606566147. The next prime is 651665606566157.

651665606566156 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (651665606566157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 294389976 + ... + 296595328.

It is an arithmetic number, because the mean of its divisors is an integer number (14773203321660).

Almost surely, 2^{651665606566156} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651665606566156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709113759439680).

651665606566156 is an abundant number, since it is smaller than the sum of its proper divisors (766561912313204).

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

651665606566156 is a wasteful number, since it uses less digits than its factorization.

651665606566156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213843 (or 2213841 counting only the distinct ones).

The product of its (nonzero) digits is 1049760000, while the sum is 70.

The spelling of 651665606566156 in words is "six hundred fifty-one trillion, six hundred sixty-five billion, six hundred six million, five hundred sixty-six thousand, one hundred fifty-six".