51972821782 has 16 divisors (see below), whose sum is σ = 91168273152. Its totient is φ = 21756064680.

The previous prime is 51972821737. The next prime is 51972821833. The reversal of 51972821782 is 28712827915.

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, 43166194 + ... + 43167397.

It is an arithmetic number, because the mean of its divisors is an integer number (5698017072).

Almost surely, 2^51972821782 is an apocalyptic number.

51972821782 is a deficient number, since it is larger than the sum of its proper divisors (39195451370).

51972821782 is a wasteful number, since it uses less digits than its factorization.

51972821782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86333643.

The product of its digits is 1128960, while the sum is 52.

The spelling of 51972821782 in words is "fifty-one billion, nine hundred seventy-two million, eight hundred twenty-one thousand, seven hundred eighty-two".