51663385 has 16 divisors (see below), whose sum is σ = 62928000. Its totient is φ = 40715136.

The previous prime is 51663383. The next prime is 51663389. The reversal of 51663385 is 58336615.

It is a cyclic number.

It is not a de Polignac number, because 51663385 - 2¹ = 51663383 is a prime.

Its product of digits (64800) is a multiple of the sum of its prime divisors (720).

It is not an unprimeable number, because it can be changed into a prime (51663383) 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, 136126 + ... + 136504.

It is an arithmetic number, because the mean of its divisors is an integer number (3933000).

Almost surely, 2^51663385 is an apocalyptic number.

It is an amenable number.

51663385 is a deficient number, since it is larger than the sum of its proper divisors (11264615).

51663385 is a wasteful number, since it uses less digits than its factorization.

51663385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

The product of its digits is 64800, while the sum is 37.

The square root of 51663385 is about 7187.7246051863. The cubic root of 51663385 is about 372.4439745778.

The spelling of 51663385 in words is "fifty-one million, six hundred sixty-three thousand, three hundred eighty-five".