51081374605 has 8 divisors (see below), whose sum is σ = 61461988632. Its totient is φ = 40755540288.

The previous prime is 51081374593. The next prime is 51081374621. The reversal of 51081374605 is 50647318015.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11162133801 + 39919240804 = 105651^2 + 199798^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51081374605 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13692874 + ... + 13696603.

It is an arithmetic number, because the mean of its divisors is an integer number (7682748579).

Almost surely, 2^51081374605 is an apocalyptic number.

It is an amenable number.

51081374605 is a deficient number, since it is larger than the sum of its proper divisors (10380614027).

51081374605 is a wasteful number, since it uses less digits than its factorization.

51081374605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27389855.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 51081374605 in words is "fifty-one billion, eighty-one million, three hundred seventy-four thousand, six hundred five".