51509916451 has 16 divisors (see below), whose sum is σ = 59889742848. Its totient is φ = 43389410400.

The previous prime is 51509916421. The next prime is 51509916467. The reversal of 51509916451 is 15461990515.

It is not a de Polignac number, because 51509916451 - 2⁹ = 51509915939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51509916421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12060 + ... + 321193.

It is an arithmetic number, because the mean of its divisors is an integer number (3743108928).

Almost surely, 2^51509916451 is an apocalyptic number.

51509916451 is a deficient number, since it is larger than the sum of its proper divisors (8379826397).

51509916451 is a wasteful number, since it uses less digits than its factorization.

51509916451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333642.

The product of its (nonzero) digits is 243000, while the sum is 46.

The spelling of 51509916451 in words is "fifty-one billion, five hundred nine million, nine hundred sixteen thousand, four hundred fifty-one".