51961255942566 has 32 divisors (see below), whose sum is σ = 106731697452768. Its totient is φ = 16852225167360.

The previous prime is 51961255942543. The next prime is 51961255942567. The reversal of 51961255942566 is 66524955216915.

51961255942566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51961255942497 and 51961255942506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51961255942567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75100336 + ... + 75789068.

It is an arithmetic number, because the mean of its divisors is an integer number (3335365545399).

Almost surely, 2^{51961255942566} is an apocalyptic number.

51961255942566 is an abundant number, since it is smaller than the sum of its proper divisors (54770441510202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51961255942566 is a wasteful number, since it uses less digits than its factorization.

51961255942566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028616.

The product of its digits is 174960000, while the sum is 66.

The spelling of 51961255942566 in words is "fifty-one trillion, nine hundred sixty-one billion, two hundred fifty-five million, nine hundred forty-two thousand, five hundred sixty-six".