51281358830 has 32 divisors (see below), whose sum is σ = 99469435968. Its totient is φ = 18922752000.

The previous prime is 51281358803. The next prime is 51281358881. The reversal of 51281358830 is 3885318215.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84935 + ... + 331325.

It is an arithmetic number, because the mean of its divisors is an integer number (3108419874).

Almost surely, 2^51281358830 is an apocalyptic number.

51281358830 is a deficient number, since it is larger than the sum of its proper divisors (48188077138).

51281358830 is a wasteful number, since it uses less digits than its factorization.

51281358830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248012.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 51281358830 in words is "fifty-one billion, two hundred eighty-one million, three hundred fifty-eight thousand, eight hundred thirty".