37977447749 has 2 divisors, whose sum is σ = 37977447750. Its totient is φ = 37977447748.

The previous prime is 37977447719. The next prime is 37977447821. The reversal of 37977447749 is 94774477973.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33158589025 + 4818858724 = 182095^2 + 69418^2 .

It is a cyclic number.

It is not a de Polignac number, because 37977447749 - 2³² = 33682480453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37977447709) 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, 18988723874 + 18988723875.

It is an arithmetic number, because the mean of its divisors is an integer number (18988723875).

Almost surely, 2^37977447749 is an apocalyptic number.

It is an amenable number.

37977447749 is a deficient number, since it is larger than the sum of its proper divisors (1).

37977447749 is an equidigital number, since it uses as much as digits as its factorization.

37977447749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 261382464, while the sum is 68.

The spelling of 37977447749 in words is "thirty-seven billion, nine hundred seventy-seven million, four hundred forty-seven thousand, seven hundred forty-nine".