51606556 has 12 divisors (see below), whose sum is σ = 91206360. Its totient is φ = 25547600.

The previous prime is 51606523. The next prime is 51606559. The reversal of 51606556 is 65560615.

It is a super-2 number, since 2×51606556² = 5326473244362272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51606559) 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, 63466 + ... + 64273.

It is an arithmetic number, because the mean of its divisors is an integer number (7600530).

Almost surely, 2^51606556 is an apocalyptic number.

It is an amenable number.

51606556 is a deficient number, since it is larger than the sum of its proper divisors (39599804).

51606556 is a wasteful number, since it uses less digits than its factorization.

51606556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127844 (or 127842 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 51606556 is about 7183.7703192683. The cubic root of 51606556 is about 372.3073634233.

The spelling of 51606556 in words is "fifty-one million, six hundred six thousand, five hundred fifty-six".