51521355404 has 24 divisors (see below), whose sum is σ = 90834718800. Its totient is φ = 25569183744.

The previous prime is 51521355323. The next prime is 51521355407. The reversal of 51521355404 is 40455312515.

It is not an unprimeable number, because it can be changed into a prime (51521355407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266672 + ... + 417320.

It is an arithmetic number, because the mean of its divisors is an integer number (3784779950).

Almost surely, 2^51521355404 is an apocalyptic number.

It is an amenable number.

51521355404 is a deficient number, since it is larger than the sum of its proper divisors (39313363396).

51521355404 is a wasteful number, since it uses less digits than its factorization.

51521355404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151289 (or 151287 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 51521355404 its reverse (40455312515), we get a palindrome (91976667919).

The spelling of 51521355404 in words is "fifty-one billion, five hundred twenty-one million, three hundred fifty-five thousand, four hundred four".