51017956947 has 36 divisors (see below), whose sum is σ = 80321109960. Its totient is φ = 31998748032.

The previous prime is 51017956939. The next prime is 51017956949. The reversal of 51017956947 is 74965971015.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

51017956947 is a `hidden beast` number, since 5 + 1 + 0 + 1 + 79 + 569 + 4 + 7 = 666.

It is not a de Polignac number, because 51017956947 - 2³ = 51017956939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51017956893 and 51017956902.

It is not an unprimeable number, because it can be changed into a prime (51017956949) 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 35 ways as a sum of consecutive naturals, for example, 19950993 + ... + 19953549.

Almost surely, 2^51017956947 is an apocalyptic number.

51017956947 is a deficient number, since it is larger than the sum of its proper divisors (29303153013).

51017956947 is an frugal number, since it uses more digits than its factorization.

51017956947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5157 (or 2577 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 54.

The spelling of 51017956947 in words is "fifty-one billion, seventeen million, nine hundred fifty-six thousand, nine hundred forty-seven".