51730664501 has 4 divisors (see below), whose sum is σ = 51738727404. Its totient is φ = 51722601600.

The previous prime is 51730664477. The next prime is 51730664527. The reversal of 51730664501 is 10546603715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10546603715 = 5 ⋅2109320743.

It can be written as a sum of positive squares in 2 ways, for example, as 20825376100 + 30905288401 = 144310^2 + 175799^2 .

It is a cyclic number.

It is not a de Polignac number, because 51730664501 - 2¹⁰ = 51730663477 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 (51730664561) 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, 4021820 + ... + 4034661.

It is an arithmetic number, because the mean of its divisors is an integer number (12934681851).

Almost surely, 2^51730664501 is an apocalyptic number.

It is an amenable number.

51730664501 is a deficient number, since it is larger than the sum of its proper divisors (8062903).

51730664501 is an equidigital number, since it uses as much as digits as its factorization.

51730664501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8062902.

The product of its (nonzero) digits is 75600, while the sum is 38.

The spelling of 51730664501 in words is "fifty-one billion, seven hundred thirty million, six hundred sixty-four thousand, five hundred one".