37977754981 has 2 divisors, whose sum is σ = 37977754982. Its totient is φ = 37977754980.

The previous prime is 37977754973. The next prime is 37977755003. The reversal of 37977754981 is 18945777973.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37888622500 + 89132481 = 194650^2 + 9441^2 .

It is a cyclic number.

It is not a de Polignac number, because 37977754981 - 2³ = 37977754973 is a prime.

It is a super-2 number, since 2×37977754981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37977754681) 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, 18988877490 + 18988877491.

It is an arithmetic number, because the mean of its divisors is an integer number (18988877491).

Almost surely, 2^37977754981 is an apocalyptic number.

It is an amenable number.

37977754981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37977754981 is an equidigital number, since it uses as much as digits as its factorization.

37977754981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93350880, while the sum is 67.

The spelling of 37977754981 in words is "thirty-seven billion, nine hundred seventy-seven million, seven hundred fifty-four thousand, nine hundred eighty-one".