51857625038 has 4 divisors (see below), whose sum is σ = 77786437560. Its totient is φ = 25928812518.

The previous prime is 51857625037. The next prime is 51857625049. The reversal of 51857625038 is 83052675815.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51857625037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12964406258 + ... + 12964406261.

It is an arithmetic number, because the mean of its divisors is an integer number (19446609390).

Almost surely, 2^51857625038 is an apocalyptic number.

51857625038 is a deficient number, since it is larger than the sum of its proper divisors (25928812522).

51857625038 is a wasteful number, since it uses less digits than its factorization.

51857625038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25928812521.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The spelling of 51857625038 in words is "fifty-one billion, eight hundred fifty-seven million, six hundred twenty-five thousand, thirty-eight".