51665998 has 8 divisors (see below), whose sum is σ = 77595192. Its totient is φ = 25800936.

The previous prime is 51665989. The next prime is 51666001. The reversal of 51665998 is 89956615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13965 + ... + 17272.

It is an arithmetic number, because the mean of its divisors is an integer number (9699399).

Almost surely, 2^51665998 is an apocalyptic number.

51665998 is a deficient number, since it is larger than the sum of its proper divisors (25929194).

51665998 is a wasteful number, since it uses less digits than its factorization.

51665998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32066.

The product of its digits is 583200, while the sum is 49.

The square root of 51665998 is about 7187.9063711209. The cubic root of 51665998 is about 372.4502535553.

The spelling of 51665998 in words is "fifty-one million, six hundred sixty-five thousand, nine hundred ninety-eight".