51366557 has 12 divisors (see below), whose sum is σ = 59435040. Its totient is φ = 44237160.

The previous prime is 51366529. The next prime is 51366559. The reversal of 51366557 is 75566315.

It is a de Polignac number, because none of the positive numbers 2^k-51366557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51366557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51366559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8873 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (4952920).

Almost surely, 2^51366557 is an apocalyptic number.

It is an amenable number.

51366557 is a deficient number, since it is larger than the sum of its proper divisors (8068483).

51366557 is a wasteful number, since it uses less digits than its factorization.

51366557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22384 (or 22373 counting only the distinct ones).

The product of its digits is 94500, while the sum is 38.

The square root of 51366557 is about 7167.0466023321. The cubic root of 51366557 is about 371.7293214389.

The spelling of 51366557 in words is "fifty-one million, three hundred sixty-six thousand, five hundred fifty-seven".