51261651444253 has 4 divisors (see below), whose sum is σ = 51317921095488. Its totient is φ = 51205381793020.

The previous prime is 51261651444197. The next prime is 51261651444257. The reversal of 51261651444253 is 35244415616215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51261651444253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51261651444197 and 51261651444206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51261651444257) 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, 28134824251 + ... + 28134826072.

It is an arithmetic number, because the mean of its divisors is an integer number (12829480273872).

Almost surely, 2^{51261651444253} is an apocalyptic number.

It is an amenable number.

51261651444253 is a deficient number, since it is larger than the sum of its proper divisors (56269651235).

51261651444253 is an equidigital number, since it uses as much as digits as its factorization.

51261651444253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56269651234.

The product of its digits is 3456000, while the sum is 49.

The spelling of 51261651444253 in words is "fifty-one trillion, two hundred sixty-one billion, six hundred fifty-one million, four hundred forty-four thousand, two hundred fifty-three".