51091408659 has 4 divisors (see below), whose sum is σ = 68121878216. Its totient is φ = 34060939104.

The previous prime is 51091408657. The next prime is 51091408673. The reversal of 51091408659 is 95680419015.

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

It is not a de Polignac number, because 51091408659 - 2¹ = 51091408657 is a prime.

It is a super-2 number, since 2×51091408659² (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 (51091408657) 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 3 ways as a sum of consecutive naturals, for example, 8515234774 + ... + 8515234779.

It is an arithmetic number, because the mean of its divisors is an integer number (17030469554).

Almost surely, 2^51091408659 is an apocalyptic number.

51091408659 is a deficient number, since it is larger than the sum of its proper divisors (17030469557).

51091408659 is a wasteful number, since it uses less digits than its factorization.

51091408659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17030469556.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 51091408659 in words is "fifty-one billion, ninety-one million, four hundred eight thousand, six hundred fifty-nine".