51115649587 has 4 divisors (see below), whose sum is σ = 51300182896. Its totient is φ = 50931116280.

The previous prime is 51115649569. The next prime is 51115649597. The reversal of 51115649587 is 78594651115.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51115649587 - 2²⁷ = 50981431859 is a prime.

It is a super-2 number, since 2×51115649587² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51115649597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92266239 + ... + 92266792.

It is an arithmetic number, because the mean of its divisors is an integer number (12825045724).

Almost surely, 2^51115649587 is an apocalyptic number.

51115649587 is a deficient number, since it is larger than the sum of its proper divisors (184533309).

51115649587 is a wasteful number, since it uses less digits than its factorization.

51115649587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184533308.

The product of its digits is 1512000, while the sum is 52.

The spelling of 51115649587 in words is "fifty-one billion, one hundred fifteen million, six hundred forty-nine thousand, five hundred eighty-seven".