40138279161 has 8 divisors (see below), whose sum is σ = 53528258784. Its totient is φ = 26753576160.

The previous prime is 40138279141. The next prime is 40138279163. The reversal of 40138279161 is 16197283104.

It is a happy number.

40138279161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40138279161 - 2¹⁰ = 40138278137 is a prime.

It is a super-2 number, since 2×40138279161² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (40138279163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301371 + ... + 1331856.

It is an arithmetic number, because the mean of its divisors is an integer number (6691032348).

Almost surely, 2^40138279161 is an apocalyptic number.

It is an amenable number.

40138279161 is a deficient number, since it is larger than the sum of its proper divisors (13389979623).

40138279161 is a wasteful number, since it uses less digits than its factorization.

40138279161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638311.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 40138279161 in words is "forty billion, one hundred thirty-eight million, two hundred seventy-nine thousand, one hundred sixty-one".