51809963726 has 4 divisors (see below), whose sum is σ = 77714945592. Its totient is φ = 25904981862.

The previous prime is 51809963719. The next prime is 51809963731. The reversal of 51809963726 is 62736990815.

It is a happy number.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 12952490930 + ... + 12952490933.

It is an arithmetic number, because the mean of its divisors is an integer number (19428736398).

Almost surely, 2^51809963726 is an apocalyptic number.

51809963726 is a deficient number, since it is larger than the sum of its proper divisors (25904981866).

51809963726 is a wasteful number, since it uses less digits than its factorization.

51809963726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25904981865.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 51809963726 in words is "fifty-one billion, eight hundred nine million, nine hundred sixty-three thousand, seven hundred twenty-six".