220618550461 has 2 divisors, whose sum is σ = 220618550462. Its totient is φ = 220618550460.

The previous prime is 220618550437. The next prime is 220618550513. The reversal of 220618550461 is 164055816022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194137172100 + 26481378361 = 440610^2 + 162731^2 .

It is a cyclic number.

It is not a de Polignac number, because 220618550461 - 2²³ = 220610161853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220618550561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110309275230 + 110309275231.

It is an arithmetic number, because the mean of its divisors is an integer number (110309275231).

Almost surely, 2^220618550461 is an apocalyptic number.

It is an amenable number.

220618550461 is a deficient number, since it is larger than the sum of its proper divisors (1).

220618550461 is an equidigital number, since it uses as much as digits as its factorization.

220618550461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 220618550461 in words is "two hundred twenty billion, six hundred eighteen million, five hundred fifty thousand, four hundred sixty-one".