51806257436 has 12 divisors (see below), whose sum is σ = 95993947728. Its totient is φ = 24379415232.

The previous prime is 51806257427. The next prime is 51806257439. The reversal of 51806257436 is 63475260815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51806257439) 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, 380928296 + ... + 380928431.

It is an arithmetic number, because the mean of its divisors is an integer number (7999495644).

Almost surely, 2^51806257436 is an apocalyptic number.

It is an amenable number.

51806257436 is a deficient number, since it is larger than the sum of its proper divisors (44187690292).

51806257436 is a wasteful number, since it uses less digits than its factorization.

51806257436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761856748 (or 761856746 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 51806257436 in words is "fifty-one billion, eight hundred six million, two hundred fifty-seven thousand, four hundred thirty-six".