51870506461 has 4 divisors (see below), whose sum is σ = 51898143132. Its totient is φ = 51842869792.

The previous prime is 51870506417. The next prime is 51870506473. The reversal of 51870506461 is 16460507815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16460507815 = 5 ⋅3292101563.

It can be written as a sum of positive squares in 2 ways, for example, as 19688299225 + 32182207236 = 140315^2 + 179394^2 .

It is a cyclic number.

It is not a de Polignac number, because 51870506461 - 2⁷ = 51870506333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51870506491) 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, 13815520 + ... + 13819273.

It is an arithmetic number, because the mean of its divisors is an integer number (12974535783).

Almost surely, 2^51870506461 is an apocalyptic number.

It is an amenable number.

51870506461 is a deficient number, since it is larger than the sum of its proper divisors (27636671).

51870506461 is a wasteful number, since it uses less digits than its factorization.

51870506461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27636670.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 51870506461 in words is "fifty-one billion, eight hundred seventy million, five hundred six thousand, four hundred sixty-one".