51953779878 has 128 divisors (see below), whose sum is σ = 142360243200. Its totient is φ = 12456380160.

The previous prime is 51953779861. The next prime is 51953779907. The reversal of 51953779878 is 87897735915.

It is a super-2 number, since 2×51953779878² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 206026 + ... + 382562.

It is an arithmetic number, because the mean of its divisors is an integer number (1112189400).

Almost surely, 2^51953779878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51953779878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71180121600).

51953779878 is an abundant number, since it is smaller than the sum of its proper divisors (90406463322).

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

51953779878 is a wasteful number, since it uses less digits than its factorization.

51953779878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176587 (or 176573 counting only the distinct ones).

The product of its digits is 133358400, while the sum is 69.

The spelling of 51953779878 in words is "fifty-one billion, nine hundred fifty-three million, seven hundred seventy-nine thousand, eight hundred seventy-eight".