51521142404 has 6 divisors (see below), whose sum is σ = 90161999214. Its totient is φ = 25760571200.

The previous prime is 51521142401. The next prime is 51521142419. The reversal of 51521142404 is 40424112515.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51482702404 + 38440000 = 226898^2 + 6200^2 .

It is a super-2 number, since 2×51521142404² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51521142401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6440142797 + ... + 6440142804.

It is an arithmetic number, because the mean of its divisors is an integer number (15026999869).

Almost surely, 2^51521142404 is an apocalyptic number.

It is an amenable number.

51521142404 is a deficient number, since it is larger than the sum of its proper divisors (38640856810).

51521142404 is a wasteful number, since it uses less digits than its factorization.

51521142404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880285605 (or 12880285603 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 51521142404 its reverse (40424112515), we get a palindrome (91945254919).

The spelling of 51521142404 in words is "fifty-one billion, five hundred twenty-one million, one hundred forty-two thousand, four hundred four".