51645734139 has 16 divisors (see below), whose sum is σ = 69248662560. Its totient is φ = 34236840960.

The previous prime is 51645734099. The next prime is 51645734143. The reversal of 51645734139 is 93143754615.

It is not a de Polignac number, because 51645734139 - 2²¹ = 51643636987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51645734839) 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 15 ways as a sum of consecutive naturals, for example, 1093269 + ... + 1139529.

It is an arithmetic number, because the mean of its divisors is an integer number (4328041410).

Almost surely, 2^51645734139 is an apocalyptic number.

51645734139 is a deficient number, since it is larger than the sum of its proper divisors (17602928421).

51645734139 is a wasteful number, since it uses less digits than its factorization.

51645734139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48350.

The product of its digits is 1360800, while the sum is 48.

The spelling of 51645734139 in words is "fifty-one billion, six hundred forty-five million, seven hundred thirty-four thousand, one hundred thirty-nine".