221640307430653 has 4 divisors (see below), whose sum is σ = 222348423429148. Its totient is φ = 220932191432160.

The previous prime is 221640307430639. The next prime is 221640307430923. The reversal of 221640307430653 is 356034703046122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55672818262084 + 165967489168569 = 7461422^2 + 12882837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221640307430653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221640307430053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354057998778 + ... + 354057999403.

It is an arithmetic number, because the mean of its divisors is an integer number (55587105857287).

Almost surely, 2^{221640307430653} is an apocalyptic number.

It is an amenable number.

221640307430653 is a deficient number, since it is larger than the sum of its proper divisors (708115998495).

221640307430653 is an equidigital number, since it uses as much as digits as its factorization.

221640307430653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708115998494.

The product of its (nonzero) digits is 2177280, while the sum is 46.

The spelling of 221640307430653 in words is "two hundred twenty-one trillion, six hundred forty billion, three hundred seven million, four hundred thirty thousand, six hundred fifty-three".