51905492138 has 8 divisors (see below), whose sum is σ = 77879343360. Its totient is φ = 25945711020.

The previous prime is 51905492137. The next prime is 51905492159. The reversal of 51905492138 is 83129450915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×51905492138² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51905492092 and 51905492101.

It is not an unprimeable number, because it can be changed into a prime (51905492137) 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 in 3 ways as a sum of consecutive naturals, for example, 3508298 + ... + 3523061.

It is an arithmetic number, because the mean of its divisors is an integer number (9734917920).

Almost surely, 2^51905492138 is an apocalyptic number.

51905492138 is a deficient number, since it is larger than the sum of its proper divisors (25973851222).

51905492138 is a wasteful number, since it uses less digits than its factorization.

51905492138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7035052.

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 51905492138 in words is "fifty-one billion, nine hundred five million, four hundred ninety-two thousand, one hundred thirty-eight".