51706721053 has 8 divisors (see below), whose sum is σ = 55687499000. Its totient is φ = 47726419968.

The previous prime is 51706721029. The next prime is 51706721119. The reversal of 51706721053 is 35012760715.

It can be written as a sum of positive squares in 4 ways, for example, as 4392640729 + 47314080324 = 66277^2 + 217518^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51706721053 - 2²⁵ = 51673166621 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 (51706721023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124453 + ... + 344821.

It is an arithmetic number, because the mean of its divisors is an integer number (6960937375).

Almost surely, 2^51706721053 is an apocalyptic number.

It is an amenable number.

51706721053 is a deficient number, since it is larger than the sum of its proper divisors (3980777947).

51706721053 is a wasteful number, since it uses less digits than its factorization.

51706721053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238431.

The product of its (nonzero) digits is 44100, while the sum is 37.

The spelling of 51706721053 in words is "fifty-one billion, seven hundred six million, seven hundred twenty-one thousand, fifty-three".