51381851128 has 8 divisors (see below), whose sum is σ = 96340970880. Its totient is φ = 25690925560.

The previous prime is 51381851021. The next prime is 51381851173. The reversal of 51381851128 is 82115818315.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3211365688 + ... + 3211365703.

It is an arithmetic number, because the mean of its divisors is an integer number (12042621360).

Almost surely, 2^51381851128 is an apocalyptic number.

It is an amenable number.

51381851128 is a deficient number, since it is larger than the sum of its proper divisors (44959119752).

51381851128 is a wasteful number, since it uses less digits than its factorization.

51381851128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6422731397 (or 6422731393 counting only the distinct ones).

The product of its digits is 76800, while the sum is 43.

The spelling of 51381851128 in words is "fifty-one billion, three hundred eighty-one million, eight hundred fifty-one thousand, one hundred twenty-eight".