138535544212 has 36 divisors (see below), whose sum is σ = 262727970876. Its totient is φ = 63889013760.

The previous prime is 138535544209. The next prime is 138535544311. The reversal of 138535544212 is 212445535831.

It can be written as a sum of positive squares in 6 ways, for example, as 39539731716 + 98995812496 = 198846^2 + 314636^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 783012 + ... + 943492.

It is an arithmetic number, because the mean of its divisors is an integer number (7297999191).

Almost surely, 2^138535544212 is an apocalyptic number.

It is an amenable number.

138535544212 is a deficient number, since it is larger than the sum of its proper divisors (124192426664).

138535544212 is a wasteful number, since it uses less digits than its factorization.

138535544212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161788 (or 161773 counting only the distinct ones).

The product of its digits is 576000, while the sum is 43.

The spelling of 138535544212 in words is "one hundred thirty-eight billion, five hundred thirty-five million, five hundred forty-four thousand, two hundred twelve".