51642663 has 4 divisors (see below), whose sum is σ = 68856888. Its totient is φ = 34428440.

The previous prime is 51642629. The next prime is 51642671. The reversal of 51642663 is 36624615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51642663 - 2⁸ = 51642407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51642623) 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, 8607108 + ... + 8607113.

It is an arithmetic number, because the mean of its divisors is an integer number (17214222).

Almost surely, 2^51642663 is an apocalyptic number.

51642663 is a deficient number, since it is larger than the sum of its proper divisors (17214225).

51642663 is a wasteful number, since it uses less digits than its factorization.

51642663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17214224.

The product of its digits is 25920, while the sum is 33.

The square root of 51642663 is about 7186.2829752244. The cubic root of 51642663 is about 372.3941726008.

The spelling of 51642663 in words is "fifty-one million, six hundred forty-two thousand, six hundred sixty-three".