37991266717 has 2 divisors, whose sum is σ = 37991266718. Its totient is φ = 37991266716.

The previous prime is 37991266699. The next prime is 37991266721. The reversal of 37991266717 is 71766219973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34898349721 + 3092916996 = 186811^2 + 55614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37991266717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37991266727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18995633358 + 18995633359.

It is an arithmetic number, because the mean of its divisors is an integer number (18995633359).

Almost surely, 2^37991266717 is an apocalyptic number.

It is an amenable number.

37991266717 is a deficient number, since it is larger than the sum of its proper divisors (1).

37991266717 is an equidigital number, since it uses as much as digits as its factorization.

37991266717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6001128, while the sum is 58.

The spelling of 37991266717 in words is "thirty-seven billion, nine hundred ninety-one million, two hundred sixty-six thousand, seven hundred seventeen".