65651561010156 has 288 divisors, whose sum is σ = 182172600529920. Its totient is φ = 18197841542400.

The previous prime is 65651561010149. The next prime is 65651561010209. The reversal of 65651561010156 is 65101016515656.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 449709231 + ... + 449855193.

It is an arithmetic number, because the mean of its divisors is an integer number (632543751840).

Almost surely, 2^{65651561010156} is an apocalyptic number.

65651561010156 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65651561010156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91086300264960).

65651561010156 is an abundant number, since it is smaller than the sum of its proper divisors (116521039519764).

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

65651561010156 is a wasteful number, since it uses less digits than its factorization.

65651561010156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146205 (or 146166 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 65651561010156 in words is "sixty-five trillion, six hundred fifty-one billion, five hundred sixty-one million, ten thousand, one hundred fifty-six".