51992155505 has 4 divisors (see below), whose sum is σ = 62390586612. Its totient is φ = 41593724400.

The previous prime is 51992155493. The next prime is 51992155511. The reversal of 51992155505 is 50555129915.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50555129915 = 5 ⋅10111025983.

It can be written as a sum of positive squares in 2 ways, for example, as 20840964496 + 31151191009 = 144364^2 + 176497^2 .

It is not a de Polignac number, because 51992155505 - 2¹⁰ = 51992154481 is a prime.

It is a super-2 number, since 2×51992155505² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51992155505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5199215546 + ... + 5199215555.

It is an arithmetic number, because the mean of its divisors is an integer number (15597646653).

Almost surely, 2^51992155505 is an apocalyptic number.

It is an amenable number.

51992155505 is a deficient number, since it is larger than the sum of its proper divisors (10398431107).

51992155505 is a wasteful number, since it uses less digits than its factorization.

51992155505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10398431106.

The product of its (nonzero) digits is 506250, while the sum is 47.

The spelling of 51992155505 in words is "fifty-one billion, nine hundred ninety-two million, one hundred fifty-five thousand, five hundred five".