51949940617578 has 16 divisors (see below), whose sum is σ = 103900307777280. Its totient is φ = 17316575782176.

The previous prime is 51949940617559. The next prime is 51949940617591. The reversal of 51949940617578 is 87571604994915.

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, 16178275 + ... + 19121622.

It is an arithmetic number, because the mean of its divisors is an integer number (6493769236080).

Almost surely, 2^{51949940617578} is an apocalyptic number.

51949940617578 is an abundant number, since it is smaller than the sum of its proper divisors (51950367159702).

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

51949940617578 is a wasteful number, since it uses less digits than its factorization.

51949940617578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35545181.

The product of its (nonzero) digits is 685843200, while the sum is 75.

The spelling of 51949940617578 in words is "fifty-one trillion, nine hundred forty-nine billion, nine hundred forty million, six hundred seventeen thousand, five hundred seventy-eight".