51219827705617 has 16 divisors (see below), whose sum is σ = 54114747982848. Its totient is φ = 48381096258000.

The previous prime is 51219827705591. The next prime is 51219827705771. The reversal of 51219827705617 is 71650772891215.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51219827705617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51219827705017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1662573 + ... + 10256890.

It is an arithmetic number, because the mean of its divisors is an integer number (3382171748928).

Almost surely, 2^{51219827705617} is an apocalyptic number.

It is an amenable number.

51219827705617 is a deficient number, since it is larger than the sum of its proper divisors (2894920277231).

51219827705617 is a wasteful number, since it uses less digits than its factorization.

51219827705617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11921820.

The product of its (nonzero) digits is 14817600, while the sum is 61.

The spelling of 51219827705617 in words is "fifty-one trillion, two hundred nineteen billion, eight hundred twenty-seven million, seven hundred five thousand, six hundred seventeen".