1278993936418 has 8 divisors (see below), whose sum is σ = 2092899168720. Its totient is φ = 581360880180.

The previous prime is 1278993936397. The next prime is 1278993936439. The reversal of 1278993936418 is 8146393998721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1278993936397) and next prime (1278993936439).

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

It is a super-2 number, since 2×1278993936418² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29068043988 + ... + 29068044031.

It is an arithmetic number, because the mean of its divisors is an integer number (261612396090).

Almost surely, 2^{1278993936418} is an apocalyptic number.

1278993936418 is a deficient number, since it is larger than the sum of its proper divisors (813905232302).

1278993936418 is a wasteful number, since it uses less digits than its factorization.

1278993936418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58136088032.

The product of its digits is 141087744, while the sum is 70.

The spelling of 1278993936418 in words is "one trillion, two hundred seventy-eight billion, nine hundred ninety-three million, nine hundred thirty-six thousand, four hundred eighteen".