51645168 has 40 divisors (see below), whose sum is σ = 148242000. Its totient is φ = 17214912.

The previous prime is 51645157. The next prime is 51645179. The reversal of 51645168 is 86154615.

51645168 is a `hidden beast` number, since 5 + 1 + 645 + 1 + 6 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (51645157) and next prime (51645179).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59343 + ... + 60206.

It is an arithmetic number, because the mean of its divisors is an integer number (3706050).

Almost surely, 2^51645168 is an apocalyptic number.

It is an amenable number.

51645168 is an abundant number, since it is smaller than the sum of its proper divisors (96596832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51645168 is a wasteful number, since it uses less digits than its factorization.

51645168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119566 (or 119554 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 51645168 is about 7186.4572634922. The cubic root of 51645168 is about 372.4001936711.

The spelling of 51645168 in words is "fifty-one million, six hundred forty-five thousand, one hundred sixty-eight".