51355920647 has 16 divisors (see below), whose sum is σ = 52541472000. Its totient is φ = 50181405120.

The previous prime is 51355920643. The next prime is 51355920659. The reversal of 51355920647 is 74602955315.

51355920647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51355920647 - 2² = 51355920643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51355920641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17974043 + ... + 17976899.

It is an arithmetic number, because the mean of its divisors is an integer number (3283842000).

Almost surely, 2^51355920647 is an apocalyptic number.

51355920647 is a deficient number, since it is larger than the sum of its proper divisors (1185551353).

51355920647 is a wasteful number, since it uses less digits than its factorization.

51355920647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 51355920647 in words is "fifty-one billion, three hundred fifty-five million, nine hundred twenty thousand, six hundred forty-seven".