51855648364807 has 32 divisors (see below), whose sum is σ = 61647670886400. Its totient is φ = 42676811452800.

The previous prime is 51855648364777. The next prime is 51855648364879. The reversal of 51855648364807 is 70846384655815.

It is not a de Polignac number, because 51855648364807 - 2¹¹ = 51855648362759 is a prime.

It is a super-2 number, since 2×51855648364807² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51855648364207) 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 31 ways as a sum of consecutive naturals, for example, 123126694 + ... + 123547132.

It is an arithmetic number, because the mean of its divisors is an integer number (1926489715200).

Almost surely, 2^{51855648364807} is an apocalyptic number.

51855648364807 is a deficient number, since it is larger than the sum of its proper divisors (9792022521593).

51855648364807 is a wasteful number, since it uses less digits than its factorization.

51855648364807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423847.

The product of its (nonzero) digits is 774144000, while the sum is 70.

The spelling of 51855648364807 in words is "fifty-one trillion, eight hundred fifty-five billion, six hundred forty-eight million, three hundred sixty-four thousand, eight hundred seven".