51665732436 has 24 divisors (see below), whose sum is σ = 120715648704. Its totient is φ = 17198728960.

The previous prime is 51665732429. The next prime is 51665732537. The reversal of 51665732436 is 63423756615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2888445 + ... + 2906276.

It is an arithmetic number, because the mean of its divisors is an integer number (5029818696).

Almost surely, 2^51665732436 is an apocalyptic number.

It is an amenable number.

51665732436 is an abundant number, since it is smaller than the sum of its proper divisors (69049916268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51665732436 is a wasteful number, since it uses less digits than its factorization.

51665732436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795471 (or 5795469 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 48.

The spelling of 51665732436 in words is "fifty-one billion, six hundred sixty-five million, seven hundred thirty-two thousand, four hundred thirty-six".