37255381981 has 2 divisors, whose sum is σ = 37255381982. Its totient is φ = 37255381980.

The previous prime is 37255381967. The next prime is 37255381993. The reversal of 37255381981 is 18918355273.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24763743225 + 12491638756 = 157365^2 + 111766^2 .

It is an emirp because it is prime and its reverse (18918355273) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37255381981 - 2¹³ = 37255373789 is a prime.

It is a super-2 number, since 2×37255381981² (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 (37255381081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18627690990 + 18627690991.

It is an arithmetic number, because the mean of its divisors is an integer number (18627690991).

Almost surely, 2^37255381981 is an apocalyptic number.

It is an amenable number.

37255381981 is a deficient number, since it is larger than the sum of its proper divisors (1).

37255381981 is an equidigital number, since it uses as much as digits as its factorization.

37255381981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 52.

The spelling of 37255381981 in words is "thirty-seven billion, two hundred fifty-five million, three hundred eighty-one thousand, nine hundred eighty-one".