51661371342 has 64 divisors (see below), whose sum is σ = 122192524800. Its totient is φ = 14247031680.

The previous prime is 51661371331. The next prime is 51661371361. The reversal of 51661371342 is 24317316615.

It is a self number, because there is not a number n which added to its sum of digits gives 51661371342.

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 31 ways as a sum of consecutive naturals, for example, 7561584 + ... + 7568412.

It is an arithmetic number, because the mean of its divisors is an integer number (1909258200).

Almost surely, 2^51661371342 is an apocalyptic number.

51661371342 is an abundant number, since it is smaller than the sum of its proper divisors (70531153458).

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

51661371342 is a wasteful number, since it uses less digits than its factorization.

51661371342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13081.

The product of its digits is 90720, while the sum is 39.

Adding to 51661371342 its reverse (24317316615), we get a palindrome (75978687957).

The spelling of 51661371342 in words is "fifty-one billion, six hundred sixty-one million, three hundred seventy-one thousand, three hundred forty-two".