51663636451 has 8 divisors (see below), whose sum is σ = 59056341344. Its totient is φ = 44273977920.

The previous prime is 51663636391. The next prime is 51663636461. The reversal of 51663636451 is 15463636615.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51663636451 - 2²¹ = 51661539299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51663636461) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 725130 + ... + 793183.

It is an arithmetic number, because the mean of its divisors is an integer number (7382042668).

Almost surely, 2^51663636451 is an apocalyptic number.

51663636451 is a deficient number, since it is larger than the sum of its proper divisors (7392704893).

51663636451 is a wasteful number, since it uses less digits than its factorization.

51663636451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523181.

The product of its digits is 1166400, while the sum is 46.

The spelling of 51663636451 in words is "fifty-one billion, six hundred sixty-three million, six hundred thirty-six thousand, four hundred fifty-one".