51508208361853 has 4 divisors (see below), whose sum is σ = 51511693606240. Its totient is φ = 51504723117468.

The previous prime is 51508208361803. The next prime is 51508208361893. The reversal of 51508208361853 is 35816380280515.

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 not a de Polignac number, because 51508208361853 - 2²¹ = 51508206264701 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51508208361794 and 51508208361803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51508208361803) 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, 1742600025 + ... + 1742629582.

It is an arithmetic number, because the mean of its divisors is an integer number (12877923401560).

Almost surely, 2^{51508208361853} is an apocalyptic number.

It is an amenable number.

51508208361853 is a deficient number, since it is larger than the sum of its proper divisors (3485244387).

51508208361853 is a wasteful number, since it uses less digits than its factorization.

51508208361853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485244386.

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 51508208361853 in words is "fifty-one trillion, five hundred eight billion, two hundred eight million, three hundred sixty-one thousand, eight hundred fifty-three".