51720835814 has 4 divisors (see below), whose sum is σ = 77581253724. Its totient is φ = 25860417906.

The previous prime is 51720835801. The next prime is 51720835847. The reversal of 51720835814 is 41853802715.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 12930208952 + ... + 12930208955.

It is an arithmetic number, because the mean of its divisors is an integer number (19395313431).

Almost surely, 2^51720835814 is an apocalyptic number.

51720835814 is a deficient number, since it is larger than the sum of its proper divisors (25860417910).

51720835814 is a wasteful number, since it uses less digits than its factorization.

51720835814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25860417909.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 51720835814 in words is "fifty-one billion, seven hundred twenty million, eight hundred thirty-five thousand, eight hundred fourteen".