37535766221 has 2 divisors, whose sum is σ = 37535766222. Its totient is φ = 37535766220.

The previous prime is 37535766211. The next prime is 37535766227. The reversal of 37535766221 is 12266753573.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31378225321 + 6157540900 = 177139^2 + 78470^2 .

It is an emirp because it is prime and its reverse (12266753573) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37535766221 - 2⁶ = 37535766157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37535766227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18767883110 + 18767883111.

It is an arithmetic number, because the mean of its divisors is an integer number (18767883111).

Almost surely, 2^37535766221 is an apocalyptic number.

It is an amenable number.

37535766221 is a deficient number, since it is larger than the sum of its proper divisors (1).

37535766221 is an equidigital number, since it uses as much as digits as its factorization.

37535766221 is an evil number, because the sum of its binary digits is even.

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

The spelling of 37535766221 in words is "thirty-seven billion, five hundred thirty-five million, seven hundred sixty-six thousand, two hundred twenty-one".