51406663 has 16 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 39938400.

The previous prime is 51406651. The next prime is 51406669. The reversal of 51406663 is 36660415.

It is a cyclic number.

It is not a de Polignac number, because 51406663 - 2⁹ = 51406151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51406669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32413 + ... + 33961.

It is an arithmetic number, because the mean of its divisors is an integer number (4017600).

Almost surely, 2^51406663 is an apocalyptic number.

51406663 is a deficient number, since it is larger than the sum of its proper divisors (12874937).

51406663 is a wasteful number, since it uses less digits than its factorization.

51406663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 51406663 is about 7169.8440010924. The cubic root of 51406663 is about 371.8260425911.

The spelling of 51406663 in words is "fifty-one million, four hundred six thousand, six hundred sixty-three".