51663623 has 8 divisors (see below), whose sum is σ = 56453760. Its totient is φ = 46889080.

The previous prime is 51663607. The next prime is 51663643. The reversal of 51663623 is 32636615.

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 51663623 - 2⁴ = 51663607 is a prime.

It is a super-2 number, since 2×51663623² = 5338259882972258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51663623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51663643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3686 + ... + 10812.

It is an arithmetic number, because the mean of its divisors is an integer number (7056720).

Almost surely, 2^51663623 is an apocalyptic number.

51663623 is a deficient number, since it is larger than the sum of its proper divisors (4790137).

51663623 is a wasteful number, since it uses less digits than its factorization.

51663623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7797.

The product of its digits is 19440, while the sum is 32.

The square root of 51663623 is about 7187.7411611716. The cubic root of 51663623 is about 372.4445464949. Note that the first 3 decimals are identical.

The spelling of 51663623 in words is "fifty-one million, six hundred sixty-three thousand, six hundred twenty-three".