51521240460 has 24 divisors (see below), whose sum is σ = 144259473456. Its totient is φ = 13738997440.

The previous prime is 51521240443. The next prime is 51521240467. The reversal of 51521240460 is 6404212515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51521240467) 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, 429343611 + ... + 429343730.

It is an arithmetic number, because the mean of its divisors is an integer number (6010811394).

Almost surely, 2^51521240460 is an apocalyptic number.

It is an amenable number.

51521240460 is an abundant number, since it is smaller than the sum of its proper divisors (92738232996).

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

51521240460 is a wasteful number, since it uses less digits than its factorization.

51521240460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858687353 (or 858687351 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 51521240460 its reverse (6404212515), we get a palindrome (57925452975).

The spelling of 51521240460 in words is "fifty-one billion, five hundred twenty-one million, two hundred forty thousand, four hundred sixty".