51663805538 has 16 divisors (see below), whose sum is σ = 80390741760. Its totient is φ = 24882842400.

The previous prime is 51663805537. The next prime is 51663805577. The reversal of 51663805538 is 83550836615.

It is not an unprimeable number, because it can be changed into a prime (51663805537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3981158 + ... + 3994113.

It is an arithmetic number, because the mean of its divisors is an integer number (5024421360).

Almost surely, 2^51663805538 is an apocalyptic number.

51663805538 is a deficient number, since it is larger than the sum of its proper divisors (28726936222).

51663805538 is a wasteful number, since it uses less digits than its factorization.

51663805538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7975393.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 51663805538 in words is "fifty-one billion, six hundred sixty-three million, eight hundred five thousand, five hundred thirty-eight".