51345562348621 has 4 divisors (see below), whose sum is σ = 52314346543932. Its totient is φ = 50376778153312.

The previous prime is 51345562348607. The next prime is 51345562348627. The reversal of 51345562348621 is 12684326554315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14514682714596 + 36830879634025 = 3809814^2 + 6068845^2 .

It is a cyclic number.

It is not a de Polignac number, because 51345562348621 - 2⁹ = 51345562348109 is a prime.

It is a super-2 number, since 2×51345562348621² (a number of 28 digits) contains 22 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 (51345562348627) 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, 484392097576 + ... + 484392097681.

It is an arithmetic number, because the mean of its divisors is an integer number (13078586635983).

Almost surely, 2^{51345562348621} is an apocalyptic number.

It is an amenable number.

51345562348621 is a deficient number, since it is larger than the sum of its proper divisors (968784195311).

51345562348621 is an equidigital number, since it uses as much as digits as its factorization.

51345562348621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968784195310.

The product of its digits is 20736000, while the sum is 55.

The spelling of 51345562348621 in words is "fifty-one trillion, three hundred forty-five billion, five hundred sixty-two million, three hundred forty-eight thousand, six hundred twenty-one".