51961363918 has 16 divisors (see below), whose sum is σ = 79789736880. Its totient is φ = 25370913600.

The previous prime is 51961363891. The next prime is 51961363939. The reversal of 51961363918 is 81936316915.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515103 + ... + 1549018.

It is an arithmetic number, because the mean of its divisors is an integer number (4986858555).

Almost surely, 2^51961363918 is an apocalyptic number.

51961363918 is a deficient number, since it is larger than the sum of its proper divisors (27828372962).

51961363918 is a wasteful number, since it uses less digits than its factorization.

51961363918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064323.

The product of its digits is 1049760, while the sum is 52.

The spelling of 51961363918 in words is "fifty-one billion, nine hundred sixty-one million, three hundred sixty-three thousand, nine hundred eighteen".