75991673421378 has 128 divisors (see below), whose sum is σ = 198415668245760. Its totient is φ = 21254002698240.

The previous prime is 75991673421271. The next prime is 75991673421407. The reversal of 75991673421378 is 87312437619957.

75991673421378 is a `hidden beast` number, since 7 + 5 + 9 + 9 + 167 + 3 + 421 + 37 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68118450 + ... + 69225042.

It is an arithmetic number, because the mean of its divisors is an integer number (1550122408170).

Almost surely, 2^{75991673421378} is an apocalyptic number.

75991673421378 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 75991673421378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99207834122880).

75991673421378 is an abundant number, since it is smaller than the sum of its proper divisors (122423994824382).

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

75991673421378 is a wasteful number, since it uses less digits than its factorization.

75991673421378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115521 (or 1115515 counting only the distinct ones).

The product of its digits is 480090240, while the sum is 72.

The spelling of 75991673421378 in words is "seventy-five trillion, nine hundred ninety-one billion, six hundred seventy-three million, four hundred twenty-one thousand, three hundred seventy-eight".