215605223573 has 2 divisors, whose sum is σ = 215605223574. Its totient is φ = 215605223572.

The previous prime is 215605223501. The next prime is 215605223633. The reversal of 215605223573 is 375322506512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212979481009 + 2625742564 = 461497^2 + 51242^2 .

It is a cyclic number.

It is not a de Polignac number, because 215605223573 - 2³² = 211310256277 is a prime.

It is a super-2 number, since 2×215605223573² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215605223573.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215605243573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107802611786 + 107802611787.

It is an arithmetic number, because the mean of its divisors is an integer number (107802611787).

Almost surely, 2^215605223573 is an apocalyptic number.

It is an amenable number.

215605223573 is a deficient number, since it is larger than the sum of its proper divisors (1).

215605223573 is an equidigital number, since it uses as much as digits as its factorization.

215605223573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378000, while the sum is 41.

The spelling of 215605223573 in words is "two hundred fifteen billion, six hundred five million, two hundred twenty-three thousand, five hundred seventy-three".