51511052444 has 12 divisors (see below), whose sum is σ = 90146314104. Its totient is φ = 25754962704.

The previous prime is 51511052431. The next prime is 51511052447. The reversal of 51511052444 is 44425011515.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51511052444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511052447) 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 3 ways as a sum of consecutive naturals, for example, 117407 + ... + 341769.

It is an arithmetic number, because the mean of its divisors is an integer number (7512192842).

Almost surely, 2^51511052444 is an apocalyptic number.

It is an amenable number.

51511052444 is a deficient number, since it is larger than the sum of its proper divisors (38635261660).

51511052444 is a wasteful number, since it uses less digits than its factorization.

51511052444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281764 (or 281762 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

Adding to 51511052444 its reverse (44425011515), we get a palindrome (95936063959).

The spelling of 51511052444 in words is "fifty-one billion, five hundred eleven million, fifty-two thousand, four hundred forty-four".