138857442241378 has 16 divisors (see below), whose sum is σ = 241394024340864. Its totient is φ = 58672158693120.

The previous prime is 138857442241369. The next prime is 138857442241391. The reversal of 138857442241378 is 873142244758831.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69847806975 + ... + 69847808962.

It is an arithmetic number, because the mean of its divisors is an integer number (15087126521304).

Almost surely, 2^{138857442241378} is an apocalyptic number.

138857442241378 is a deficient number, since it is larger than the sum of its proper divisors (102536582099486).

138857442241378 is a wasteful number, since it uses less digits than its factorization.

138857442241378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139695616017.

The product of its digits is 289013760, while the sum is 67.

The spelling of 138857442241378 in words is "one hundred thirty-eight trillion, eight hundred fifty-seven billion, four hundred forty-two million, two hundred forty-one thousand, three hundred seventy-eight".