37785872981 has 2 divisors, whose sum is σ = 37785872982. Its totient is φ = 37785872980.

The previous prime is 37785872977. The next prime is 37785873017. The reversal of 37785872981 is 18927858773.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34676026225 + 3109846756 = 186215^2 + 55766^2 .

It is a cyclic number.

It is not a de Polignac number, because 37785872981 - 2² = 37785872977 is a prime.

It is a super-2 number, since 2×37785872981² (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 (37785872911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18892936490 + 18892936491.

It is an arithmetic number, because the mean of its divisors is an integer number (18892936491).

Almost surely, 2^37785872981 is an apocalyptic number.

It is an amenable number.

37785872981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37785872981 is an equidigital number, since it uses as much as digits as its factorization.

37785872981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47416320, while the sum is 65.

The spelling of 37785872981 in words is "thirty-seven billion, seven hundred eighty-five million, eight hundred seventy-two thousand, nine hundred eighty-one".