37994994689 has 2 divisors, whose sum is σ = 37994994690. Its totient is φ = 37994994688.

The previous prime is 37994994649. The next prime is 37994994703. The reversal of 37994994689 is 98649949973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35775831025 + 2219163664 = 189145^2 + 47108^2 .

It is a cyclic number.

It is not a de Polignac number, because 37994994689 - 2¹⁶ = 37994929153 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (37994994619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18997497344 + 18997497345.

It is an arithmetic number, because the mean of its divisors is an integer number (18997497345).

Almost surely, 2^37994994689 is an apocalyptic number.

It is an amenable number.

37994994689 is a deficient number, since it is larger than the sum of its proper divisors (1).

37994994689 is an equidigital number, since it uses as much as digits as its factorization.

37994994689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952342272, while the sum is 77.

The spelling of 37994994689 in words is "thirty-seven billion, nine hundred ninety-four million, nine hundred ninety-four thousand, six hundred eighty-nine".