40813775138 has 4 divisors (see below), whose sum is σ = 61220662710. Its totient is φ = 20406887568.

The previous prime is 40813775131. The next prime is 40813775179. The reversal of 40813775138 is 83157731804.

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

It can be written as a sum of positive squares in only one way, i.e., 38027730049 + 2786045089 = 195007^2 + 52783^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40813775092 and 40813775101.

It is not an unprimeable number, because it can be changed into a prime (40813775131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10203443783 + ... + 10203443786.

Almost surely, 2^40813775138 is an apocalyptic number.

40813775138 is a deficient number, since it is larger than the sum of its proper divisors (20406887572).

40813775138 is a wasteful number, since it uses less digits than its factorization.

40813775138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20406887571.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 40813775138 in words is "forty billion, eight hundred thirteen million, seven hundred seventy-five thousand, one hundred thirty-eight".