37991267791 has 2 divisors, whose sum is σ = 37991267792. Its totient is φ = 37991267790.

The previous prime is 37991267723. The next prime is 37991267827. The reversal of 37991267791 is 19776219973.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 37991267791 - 2¹³ = 37991259599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37991264791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18995633895 + 18995633896.

It is an arithmetic number, because the mean of its divisors is an integer number (18995633896).

Almost surely, 2^37991267791 is an apocalyptic number.

37991267791 is a deficient number, since it is larger than the sum of its proper divisors (1).

37991267791 is an equidigital number, since it uses as much as digits as its factorization.

37991267791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9001692, while the sum is 61.

The spelling of 37991267791 in words is "thirty-seven billion, nine hundred ninety-one million, two hundred sixty-seven thousand, seven hundred ninety-one".