7881549067138 has 8 divisors (see below), whose sum is σ = 11822340301632. Its totient is φ = 3940768966596.

The previous prime is 7881549067123. The next prime is 7881549067141. The reversal of 7881549067138 is 8317609451887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7881549067138² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702670 + ... + 4031977.

It is an arithmetic number, because the mean of its divisors is an integer number (1477792537704).

Almost surely, 2^{7881549067138} is an apocalyptic number.

7881549067138 is a deficient number, since it is larger than the sum of its proper divisors (3940791234494).

7881549067138 is a wasteful number, since it uses less digits than its factorization.

7881549067138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5566976.

The product of its (nonzero) digits is 81285120, while the sum is 67.

The spelling of 7881549067138 in words is "seven trillion, eight hundred eighty-one billion, five hundred forty-nine million, sixty-seven thousand, one hundred thirty-eight".