37866370721 has 2 divisors, whose sum is σ = 37866370722. Its totient is φ = 37866370720.

The previous prime is 37866370693. The next prime is 37866370727. The reversal of 37866370721 is 12707366873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35124382225 + 2741988496 = 187415^2 + 52364^2 .

It is a cyclic number.

It is not a de Polignac number, because 37866370721 - 2⁶ = 37866370657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 37866370721.

It is not a weakly prime, because it can be changed into another prime (37866370727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18933185360 + 18933185361.

It is an arithmetic number, because the mean of its divisors is an integer number (18933185361).

Almost surely, 2^37866370721 is an apocalyptic number.

It is an amenable number.

37866370721 is a deficient number, since it is larger than the sum of its proper divisors (1).

37866370721 is an equidigital number, since it uses as much as digits as its factorization.

37866370721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The spelling of 37866370721 in words is "thirty-seven billion, eight hundred sixty-six million, three hundred seventy thousand, seven hundred twenty-one".