37881536261 has 2 divisors, whose sum is σ = 37881536262. Its totient is φ = 37881536260.

The previous prime is 37881536219. The next prime is 37881536281. The reversal of 37881536261 is 16263518873.

37881536261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36679527361 + 1202008900 = 191519^2 + 34670^2 .

It is a cyclic number.

It is not a de Polignac number, because 37881536261 - 2³⁰ = 36807794437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37881536281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18940768130 + 18940768131.

It is an arithmetic number, because the mean of its divisors is an integer number (18940768131).

Almost surely, 2^37881536261 is an apocalyptic number.

It is an amenable number.

37881536261 is a deficient number, since it is larger than the sum of its proper divisors (1).

37881536261 is an equidigital number, since it uses as much as digits as its factorization.

37881536261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The spelling of 37881536261 in words is "thirty-seven billion, eight hundred eighty-one million, five hundred thirty-six thousand, two hundred sixty-one".