38185937081 has 4 divisors (see below), whose sum is σ = 40432168692. Its totient is φ = 35939705472.

The previous prime is 38185937077. The next prime is 38185937143. The reversal of 38185937081 is 18073958183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18073958183 = 19 ⋅951260957.

It can be written as a sum of positive squares in 2 ways, for example, as 34552861456 + 3633075625 = 185884^2 + 60275^2 .

It is a cyclic number.

It is not a de Polignac number, because 38185937081 - 2² = 38185937077 is a prime.

It is a super-2 number, since 2×38185937081² (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 (38185933081) 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, 1123115780 + ... + 1123115813.

It is an arithmetic number, because the mean of its divisors is an integer number (10108042173).

Almost surely, 2^38185937081 is an apocalyptic number.

It is an amenable number.

38185937081 is a deficient number, since it is larger than the sum of its proper divisors (2246231611).

38185937081 is a wasteful number, since it uses less digits than its factorization.

38185937081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246231610.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 38185937081 in words is "thirty-eight billion, one hundred eighty-five million, nine hundred thirty-seven thousand, eighty-one".