17640754138 has 16 divisors (see below), whose sum is σ = 30264462144. Its totient is φ = 7554530880.

The previous prime is 17640754133. The next prime is 17640754189. The reversal of 17640754138 is 83145704671.

It is a super-2 number, since 2×17640754138² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17640754133) 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, 463743 + ... + 500338.

It is an arithmetic number, because the mean of its divisors is an integer number (1891528884).

Almost surely, 2^17640754138 is an apocalyptic number.

17640754138 is a deficient number, since it is larger than the sum of its proper divisors (12623708006).

17640754138 is a wasteful number, since it uses less digits than its factorization.

17640754138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965397.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 17640754138 in words is "seventeen billion, six hundred forty million, seven hundred fifty-four thousand, one hundred thirty-eight".