51585258516 has 24 divisors (see below), whose sum is σ = 131307931104. Its totient is φ = 15631896480.

The previous prime is 51585258509. The next prime is 51585258539. The reversal of 51585258516 is 61585258515.

It is a super-2 number, since 2×51585258516² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195398575 + ... + 195398838.

It is an arithmetic number, because the mean of its divisors is an integer number (5471163796).

Almost surely, 2^51585258516 is an apocalyptic number.

It is an amenable number.

51585258516 is an abundant number, since it is smaller than the sum of its proper divisors (79722672588).

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

51585258516 is a wasteful number, since it uses less digits than its factorization.

51585258516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390797431 (or 390797429 counting only the distinct ones).

The product of its digits is 2400000, while the sum is 51.

Subtracting 51585258516 from its reverse (61585258515), we obtain a palindrome (9999999999).

The spelling of 51585258516 in words is "fifty-one billion, five hundred eighty-five million, two hundred fifty-eight thousand, five hundred sixteen".