51326048861 has 4 divisors (see below), whose sum is σ = 51591987132. Its totient is φ = 51060110592.

The previous prime is 51326048819. The next prime is 51326048881. The reversal of 51326048861 is 16884062315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16884062315 = 5 ⋅3376812463.

It can be written as a sum of positive squares in 2 ways, for example, as 37662776761 + 13663272100 = 194069^2 + 116890^2 .

It is a cyclic number.

It is not a de Polignac number, because 51326048861 - 2²⁶ = 51258939997 is a prime.

It is a super-3 number, since 3×51326048861³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51326048881) 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, 132968846 + ... + 132969231.

It is an arithmetic number, because the mean of its divisors is an integer number (12897996783).

Almost surely, 2^51326048861 is an apocalyptic number.

It is an amenable number.

51326048861 is a deficient number, since it is larger than the sum of its proper divisors (265938271).

51326048861 is a wasteful number, since it uses less digits than its factorization.

51326048861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265938270.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 51326048861 in words is "fifty-one billion, three hundred twenty-six million, forty-eight thousand, eight hundred sixty-one".