51211012544 has 14 divisors (see below), whose sum is σ = 101621853144. Its totient is φ = 25605506240.

The previous prime is 51211012543. The next prime is 51211012547. The reversal of 51211012544 is 44521011215.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51211012543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400085972 + ... + 400086099.

It is an arithmetic number, because the mean of its divisors is an integer number (7258703796).

Almost surely, 2^51211012544 is an apocalyptic number.

It is an amenable number.

51211012544 is a deficient number, since it is larger than the sum of its proper divisors (50410840600).

51211012544 is an equidigital number, since it uses as much as digits as its factorization.

51211012544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800172083 (or 800172073 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 51211012544 its reverse (44521011215), we get a palindrome (95732023759).

The spelling of 51211012544 in words is "fifty-one billion, two hundred eleven million, twelve thousand, five hundred forty-four".