51138167388 has 48 divisors (see below), whose sum is σ = 148765580544. Its totient is φ = 13282640640.

The previous prime is 51138167387. The next prime is 51138167429. The reversal of 51138167388 is 88376183115.

It is a super-2 number, since 2×51138167388² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51138167388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138167383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27671245 + ... + 27673092.

It is an arithmetic number, because the mean of its divisors is an integer number (3099282928).

Almost surely, 2^51138167388 is an apocalyptic number.

It is an amenable number.

51138167388 is an abundant number, since it is smaller than the sum of its proper divisors (97627413156).

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

51138167388 is a wasteful number, since it uses less digits than its factorization.

51138167388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55344362 (or 55344360 counting only the distinct ones).

The product of its digits is 967680, while the sum is 51.

The spelling of 51138167388 in words is "fifty-one billion, one hundred thirty-eight million, one hundred sixty-seven thousand, three hundred eighty-eight".