138169810943 has 16 divisors (see below), whose sum is σ = 139248385536. Its totient is φ = 137096910720.

The previous prime is 138169810921. The next prime is 138169810969. The reversal of 138169810943 is 349018961831.

It is a Cunningham number, because it is equal to 371712²-1.

It is a cyclic number.

It is not a de Polignac number, because 138169810943 - 2¹⁶ = 138169745407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138169815943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123035780 + ... + 123036902.

It is an arithmetic number, because the mean of its divisors is an integer number (8703024096).

Almost surely, 2^138169810943 is an apocalyptic number.

138169810943 is a deficient number, since it is larger than the sum of its proper divisors (1078574593).

138169810943 is a wasteful number, since it uses less digits than its factorization.

138169810943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 138169810943 in words is "one hundred thirty-eight billion, one hundred sixty-nine million, eight hundred ten thousand, nine hundred forty-three".