51585004491 has 8 divisors (see below), whose sum is σ = 68782831680. Its totient is φ = 34388590152.

The previous prime is 51585004487. The next prime is 51585004501. The reversal of 51585004491 is 19440058515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51585004491 - 2² = 51585004487 is a prime.

It is a super-2 number, since 2×51585004491² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51585004451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264861 + ... + 416318.

It is an arithmetic number, because the mean of its divisors is an integer number (8597853960).

Almost surely, 2^51585004491 is an apocalyptic number.

51585004491 is a deficient number, since it is larger than the sum of its proper divisors (17197827189).

51585004491 is a wasteful number, since it uses less digits than its factorization.

51585004491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706425.

The product of its (nonzero) digits is 144000, while the sum is 42.

The spelling of 51585004491 in words is "fifty-one billion, five hundred eighty-five million, four thousand, four hundred ninety-one".