37573566221 has 2 divisors, whose sum is σ = 37573566222. Its totient is φ = 37573566220.

The previous prime is 37573566197. The next prime is 37573566229. The reversal of 37573566221 is 12266537573.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18876012100 + 18697554121 = 137390^2 + 136739^2 .

It is a cyclic number.

It is not a de Polignac number, because 37573566221 - 2¹⁴ = 37573549837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37573566229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18786783110 + 18786783111.

It is an arithmetic number, because the mean of its divisors is an integer number (18786783111).

Almost surely, 2^37573566221 is an apocalyptic number.

It is an amenable number.

37573566221 is a deficient number, since it is larger than the sum of its proper divisors (1).

37573566221 is an equidigital number, since it uses as much as digits as its factorization.

37573566221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 47.

The spelling of 37573566221 in words is "thirty-seven billion, five hundred seventy-three million, five hundred sixty-six thousand, two hundred twenty-one".