21655147653 has 48 divisors (see below), whose sum is σ = 32591849472. Its totient is φ = 13844160000.

The previous prime is 21655147643. The next prime is 21655147663. The reversal of 21655147653 is 35674155612.

21655147653 is a `hidden beast` number, since 2 + 1 + 6 + 551 + 47 + 6 + 53 = 666.

It is an interprime number because it is at equal distance from previous prime (21655147643) and next prime (21655147663).

It is not a de Polignac number, because 21655147653 - 2¹⁰ = 21655146629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21655147599 and 21655147608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655147643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18813628 + ... + 18814778.

It is an arithmetic number, because the mean of its divisors is an integer number (678996864).

Almost surely, 2^21655147653 is an apocalyptic number.

It is an amenable number.

21655147653 is a deficient number, since it is larger than the sum of its proper divisors (10936701819).

21655147653 is a wasteful number, since it uses less digits than its factorization.

21655147653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026 (or 2023 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The spelling of 21655147653 in words is "twenty-one billion, six hundred fifty-five million, one hundred forty-seven thousand, six hundred fifty-three".