138026851866 has 12 divisors (see below), whose sum is σ = 299058179082. Its totient is φ = 46008950616.

The previous prime is 138026851709. The next prime is 138026851933. The reversal of 138026851866 is 668158620831.

138026851866 is a `hidden beast` number, since 1 + 3 + 8 + 0 + 2 + 68 + 518 + 66 = 666.

138026851866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 124165321641 + 13861530225 = 352371^2 + 117735^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3834079201 + ... + 3834079236.

Almost surely, 2^138026851866 is an apocalyptic number.

138026851866 is an abundant number, since it is smaller than the sum of its proper divisors (161031327216).

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

138026851866 is a wasteful number, since it uses less digits than its factorization.

138026851866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7668158445 (or 7668158442 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 138026851866 in words is "one hundred thirty-eight billion, twenty-six million, eight hundred fifty-one thousand, eight hundred sixty-six".