51184650721 has 8 divisors (see below), whose sum is σ = 51275441664. Its totient is φ = 51093897120.

The previous prime is 51184650703. The next prime is 51184650733. The reversal of 51184650721 is 12705648115.

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

It is a cyclic number.

It is not a de Polignac number, because 51184650721 - 2¹¹ = 51184648673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51184650701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4886736 + ... + 4897198.

It is an arithmetic number, because the mean of its divisors is an integer number (6409430208).

Almost surely, 2^51184650721 is an apocalyptic number.

It is an amenable number.

51184650721 is a deficient number, since it is larger than the sum of its proper divisors (90790943).

51184650721 is a wasteful number, since it uses less digits than its factorization.

51184650721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18671.

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 51184650721 in words is "fifty-one billion, one hundred eighty-four million, six hundred fifty thousand, seven hundred twenty-one".