51661183398 has 16 divisors (see below), whose sum is σ = 112715309376. Its totient is φ = 15654904040.

The previous prime is 51661183351. The next prime is 51661183403. The reversal of 51661183398 is 89338116615.

51661183398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51661183398.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391372536 + ... + 391372667.

It is an arithmetic number, because the mean of its divisors is an integer number (7044706836).

Almost surely, 2^51661183398 is an apocalyptic number.

51661183398 is an abundant number, since it is smaller than the sum of its proper divisors (61054125978).

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

51661183398 is a wasteful number, since it uses less digits than its factorization.

51661183398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782745219.

The product of its digits is 933120, while the sum is 51.

The spelling of 51661183398 in words is "fifty-one billion, six hundred sixty-one million, one hundred eighty-three thousand, three hundred ninety-eight".