37811923081 has 4 divisors (see below), whose sum is σ = 37822826500. Its totient is φ = 37801019664.

The previous prime is 37811923063. The next prime is 37811923129. The reversal of 37811923081 is 18032911873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2499500025 + 35312423056 = 49995^2 + 187916^2 .

It is a cyclic number.

It is not a de Polignac number, because 37811923081 - 2⁹ = 37811922569 is a prime.

It is a super-2 number, since 2×37811923081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37811923781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5446506 + ... + 5453443.

It is an arithmetic number, because the mean of its divisors is an integer number (9455706625).

Almost surely, 2^37811923081 is an apocalyptic number.

It is an amenable number.

37811923081 is a deficient number, since it is larger than the sum of its proper divisors (10903419).

37811923081 is a wasteful number, since it uses less digits than its factorization.

37811923081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10903418.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 37811923081 in words is "thirty-seven billion, eight hundred eleven million, nine hundred twenty-three thousand, eighty-one".