21997687594653 has 24 divisors (see below), whose sum is σ = 31800692716416. Its totient is φ = 14653009519200.

The previous prime is 21997687594633. The next prime is 21997687594703. The reversal of 21997687594653 is 35649578679912.

21997687594653 is a `hidden beast` number, since 2 + 1 + 9 + 9 + 76 + 87 + 5 + 9 + 465 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21997687594653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21997687594633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129064576 + ... + 129234902.

It is an arithmetic number, because the mean of its divisors is an integer number (1325028863184).

Almost surely, 2^{21997687594653} is an apocalyptic number.

It is an amenable number.

21997687594653 is a deficient number, since it is larger than the sum of its proper divisors (9803005121763).

21997687594653 is a wasteful number, since it uses less digits than its factorization.

21997687594653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182105 (or 182102 counting only the distinct ones).

The product of its digits is 6172588800, while the sum is 81.

The spelling of 21997687594653 in words is "twenty-one trillion, nine hundred ninety-seven billion, six hundred eighty-seven million, five hundred ninety-four thousand, six hundred fifty-three".