37968481861 has 2 divisors, whose sum is σ = 37968481862. Its totient is φ = 37968481860.

The previous prime is 37968481849. The next prime is 37968481871. The reversal of 37968481861 is 16818486973.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31437417636 + 6531064225 = 177306^2 + 80815^2 .

It is a cyclic number.

It is not a de Polignac number, because 37968481861 - 2²⁹ = 37431610949 is a prime.

It is a super-2 number, since 2×37968481861² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 37968481861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37968481801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18984240930 + 18984240931.

It is an arithmetic number, because the mean of its divisors is an integer number (18984240931).

Almost surely, 2^37968481861 is an apocalyptic number.

It is an amenable number.

37968481861 is a deficient number, since it is larger than the sum of its proper divisors (1).

37968481861 is an equidigital number, since it uses as much as digits as its factorization.

37968481861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 61.

The spelling of 37968481861 in words is "thirty-seven billion, nine hundred sixty-eight million, four hundred eighty-one thousand, eight hundred sixty-one".