37881226161 has 9 divisors (see below), whose sum is σ = 54718170091. Its totient is φ = 25253761512.

The previous prime is 37881226153. The next prime is 37881226183. The reversal of 37881226161 is 16162218873.

The square root of 37881226161 is 194631.

It is a perfect power (a square), and thus also a powerful number.

37881226161 is a `hidden beast` number, since 3 + 7 + 8 + 8 + 1 + 22 + 616 + 1 = 666.

37881226161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 37042776225 + 838449936 = 192465^2 + 28956^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 37881226161 - 2³ = 37881226153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37881226261) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 551455 + ... + 616331.

Almost surely, 2^37881226161 is an apocalyptic number.

37881226161 is the 194631-st square number.

37881226161 is the 97316-th centered octagonal number.

It is an amenable number.

37881226161 is a deficient number, since it is larger than the sum of its proper divisors (16836943930).

37881226161 is an frugal number, since it uses more digits than its factorization.

37881226161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129760 (or 64880 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 37881226161 in words is "thirty-seven billion, eight hundred eighty-one million, two hundred twenty-six thousand, one hundred sixty-one".