51443211505 has 128 divisors (see below), whose sum is σ = 79551590400. Its totient is φ = 31123685376.

The previous prime is 51443211499. The next prime is 51443211511. The reversal of 51443211505 is 50511234415.

It is an interprime number because it is at equal distance from previous prime (51443211499) and next prime (51443211511).

It is not a de Polignac number, because 51443211505 - 2⁹ = 51443210993 is a prime.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 185715427 + ... + 185715703.

It is an arithmetic number, because the mean of its divisors is an integer number (621496800).

Almost surely, 2^51443211505 is an apocalyptic number.

It is an amenable number.

51443211505 is a deficient number, since it is larger than the sum of its proper divisors (28108378895).

51443211505 is a wasteful number, since it uses less digits than its factorization.

51443211505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 51443211505 in words is "fifty-one billion, four hundred forty-three million, two hundred eleven thousand, five hundred five".