20156621065722 has 96 divisors (see below), whose sum is σ = 46292553216000. Its totient is φ = 6327323009280.

The previous prime is 20156621065657. The next prime is 20156621065753. The reversal of 20156621065722 is 22756012665102.

20156621065722 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 6 + 62 + 10 + 6 + 572 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83754279 + ... + 83994597.

It is an arithmetic number, because the mean of its divisors is an integer number (482214096000).

Almost surely, 2^{20156621065722} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20156621065722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23146276608000).

20156621065722 is an abundant number, since it is smaller than the sum of its proper divisors (26135932150278).

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

20156621065722 is a wasteful number, since it uses less digits than its factorization.

20156621065722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244316 (or 244313 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 20156621065722 in words is "twenty trillion, one hundred fifty-six billion, six hundred twenty-one million, sixty-five thousand, seven hundred twenty-two".