51138167278 has 16 divisors (see below), whose sum is σ = 84291449904. Its totient is φ = 23074951360.

The previous prime is 51138167239. The next prime is 51138167287. The reversal of 51138167278 is 87276183115.

It is a super-2 number, since 2×51138167278² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8480425 + ... + 8486452.

It is an arithmetic number, because the mean of its divisors is an integer number (5268215619).

Almost surely, 2^51138167278 is an apocalyptic number.

51138167278 is a deficient number, since it is larger than the sum of its proper divisors (33153282626).

51138167278 is a wasteful number, since it uses less digits than its factorization.

51138167278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16967027.

The product of its digits is 564480, while the sum is 49.

The spelling of 51138167278 in words is "fifty-one billion, one hundred thirty-eight million, one hundred sixty-seven thousand, two hundred seventy-eight".