51138167280 has 80 divisors (see below), whose sum is σ = 158985431424. Its totient is φ = 13597523200.

The previous prime is 51138167239. The next prime is 51138167287. The reversal of 51138167280 is 8276183115.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×51138167280² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51138167287) 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, 223746 + ... + 390305.

Almost surely, 2^51138167280 is an apocalyptic number.

It is an amenable number.

51138167280 is an abundant number, since it is smaller than the sum of its proper divisors (107847264144).

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

51138167280 is a wasteful number, since it uses less digits than its factorization.

51138167280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614414 (or 614408 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 51138167280 in words is "fifty-one billion, one hundred thirty-eight million, one hundred sixty-seven thousand, two hundred eighty".