51081243850 has 96 divisors (see below), whose sum is σ = 123815575296. Its totient is φ = 15215385600.

The previous prime is 51081243827. The next prime is 51081243853. The reversal of 51081243850 is 5834218015.

It is not an unprimeable number, because it can be changed into a prime (51081243853) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 252846 + ... + 407545.

It is an arithmetic number, because the mean of its divisors is an integer number (1289745576).

Almost surely, 2^51081243850 is an apocalyptic number.

51081243850 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51081243850 is an abundant number, since it is smaller than the sum of its proper divisors (72734331446).

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

51081243850 is a wasteful number, since it uses less digits than its factorization.

51081243850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660440 (or 660435 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 51081243850 in words is "fifty-one billion, eighty-one million, two hundred forty-three thousand, eight hundred fifty".