51021152544 has 24 divisors (see below), whose sum is σ = 133930525680. Its totient is φ = 17007050816.

The previous prime is 51021152543. The next prime is 51021152569. The reversal of 51021152544 is 44525112015.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (51021152543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265735074 + ... + 265735265.

It is an arithmetic number, because the mean of its divisors is an integer number (5580438570).

Almost surely, 2^51021152544 is an apocalyptic number.

It is an amenable number.

51021152544 is an abundant number, since it is smaller than the sum of its proper divisors (82909373136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51021152544 is a wasteful number, since it uses less digits than its factorization.

51021152544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531470352 (or 531470344 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 51021152544 its reverse (44525112015), we get a palindrome (95546264559).

The spelling of 51021152544 in words is "fifty-one billion, twenty-one million, one hundred fifty-two thousand, five hundred forty-four".