51949866068 has 24 divisors (see below), whose sum is σ = 94264461480. Its totient is φ = 25021301760.

The previous prime is 51949866047. The next prime is 51949866079. The reversal of 51949866068 is 86066894915.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13338402064 + 38611464004 = 115492^2 + 196498^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51949866068.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466913 + ... + 567368.

It is an arithmetic number, because the mean of its divisors is an integer number (3927685895).

Almost surely, 2^51949866068 is an apocalyptic number.

51949866068 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

51949866068 is a deficient number, since it is larger than the sum of its proper divisors (42314595412).

51949866068 is a wasteful number, since it uses less digits than its factorization.

51949866068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034747 (or 1034745 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 62.

The spelling of 51949866068 in words is "fifty-one billion, nine hundred forty-nine million, eight hundred sixty-six thousand, sixty-eight".