138256287542 has 16 divisors (see below), whose sum is σ = 207986406912. Its totient is φ = 68927591040.

The previous prime is 138256287527. The next prime is 138256287557. The reversal of 138256287542 is 245782652831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138256287527) and next prime (138256287557).

It is a super-2 number, since 2×138256287542² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2807492 + ... + 2856312.

It is an arithmetic number, because the mean of its divisors is an integer number (12999150432).

Almost surely, 2^138256287542 is an apocalyptic number.

138256287542 is a deficient number, since it is larger than the sum of its proper divisors (69730119370).

138256287542 is a wasteful number, since it uses less digits than its factorization.

138256287542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52903.

The product of its digits is 6451200, while the sum is 53.

The spelling of 138256287542 in words is "one hundred thirty-eight billion, two hundred fifty-six million, two hundred eighty-seven thousand, five hundred forty-two".