51644415215 has 16 divisors (see below), whose sum is σ = 63301938048. Its totient is φ = 40430052096.

The previous prime is 51644415169. The next prime is 51644415217. The reversal of 51644415215 is 51251444615.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51644415215 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 (51644415217) 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, 1921409 + ... + 1948101.

It is an arithmetic number, because the mean of its divisors is an integer number (3956371128).

Almost surely, 2^51644415215 is an apocalyptic number.

51644415215 is a deficient number, since it is larger than the sum of its proper divisors (11657522833).

51644415215 is a wasteful number, since it uses less digits than its factorization.

51644415215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34978.

The product of its digits is 96000, while the sum is 38.

The spelling of 51644415215 in words is "fifty-one billion, six hundred forty-four million, four hundred fifteen thousand, two hundred fifteen".