51931136578 has 8 divisors (see below), whose sum is σ = 77976930960. Its totient is φ = 25938826260.

The previous prime is 51931136573. The next prime is 51931136581. The reversal of 51931136578 is 87563113915.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51931136573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13368588 + ... + 13372471.

It is an arithmetic number, because the mean of its divisors is an integer number (9747116370).

Almost surely, 2^51931136578 is an apocalyptic number.

51931136578 is a deficient number, since it is larger than the sum of its proper divisors (26045794382).

51931136578 is a wasteful number, since it uses less digits than its factorization.

51931136578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26742032.

The product of its digits is 680400, while the sum is 49.

The spelling of 51931136578 in words is "fifty-one billion, nine hundred thirty-one million, one hundred thirty-six thousand, five hundred seventy-eight".