37978665871 has 2 divisors, whose sum is σ = 37978665872. Its totient is φ = 37978665870.

The previous prime is 37978665827. The next prime is 37978665883. The reversal of 37978665871 is 17856687973.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 37978665871 - 2⁹ = 37978665359 is a prime.

It is a super-2 number, since 2×37978665871² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 37978665797 and 37978665806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37978665271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18989332935 + 18989332936.

It is an arithmetic number, because the mean of its divisors is an integer number (18989332936).

Almost surely, 2^37978665871 is an apocalyptic number.

37978665871 is a deficient number, since it is larger than the sum of its proper divisors (1).

37978665871 is an equidigital number, since it uses as much as digits as its factorization.

37978665871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 106686720, while the sum is 67.

It can be divided in two parts, 3797 and 8665871, that added together give a palindrome (8669668).

The spelling of 37978665871 in words is "thirty-seven billion, nine hundred seventy-eight million, six hundred sixty-five thousand, eight hundred seventy-one".