138666739952 has 160 divisors (see below), whose sum is σ = 317449056960. Its totient is φ = 58092503040.

The previous prime is 138666739927. The next prime is 138666739961. The reversal of 138666739952 is 259937666831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11050802 + ... + 11063342.

It is an arithmetic number, because the mean of its divisors is an integer number (1984056606).

Almost surely, 2^138666739952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138666739952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158724528480).

138666739952 is an abundant number, since it is smaller than the sum of its proper divisors (178782317008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138666739952 is a wasteful number, since it uses less digits than its factorization.

138666739952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12691 (or 12685 counting only the distinct ones).

The product of its digits is 88179840, while the sum is 65.

The spelling of 138666739952 in words is "one hundred thirty-eight billion, six hundred sixty-six million, seven hundred thirty-nine thousand, nine hundred fifty-two".