51591378216 has 32 divisors (see below), whose sum is σ = 147403938240. Its totient is φ = 14740393728.

The previous prime is 51591378203. The next prime is 51591378233. The reversal of 51591378216 is 61287319515.

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, 153545601 + ... + 153545936.

It is an arithmetic number, because the mean of its divisors is an integer number (4606373070).

Almost surely, 2^51591378216 is an apocalyptic number.

51591378216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51591378216 is an abundant number, since it is smaller than the sum of its proper divisors (95812560024).

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

51591378216 is a wasteful number, since it uses less digits than its factorization.

51591378216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307091553 (or 307091549 counting only the distinct ones).

The product of its digits is 453600, while the sum is 48.

The spelling of 51591378216 in words is "fifty-one billion, five hundred ninety-one million, three hundred seventy-eight thousand, two hundred sixteen".