51551658 has 24 divisors (see below), whose sum is σ = 111915648. Its totient is φ = 17149992.

The previous prime is 51551657. The next prime is 51551683. The reversal of 51551658 is 85615515.

51551658 is a `hidden beast` number, since 51 + 551 + 6 + 58 = 666.

51551658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51551653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7591 + ... + 12677.

It is an arithmetic number, because the mean of its divisors is an integer number (4663152).

Almost surely, 2^51551658 is an apocalyptic number.

51551658 is an abundant number, since it is smaller than the sum of its proper divisors (60363990).

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

51551658 is a wasteful number, since it uses less digits than its factorization.

51551658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5658 (or 5655 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The square root of 51551658 is about 7179.9483285049. The cubic root of 51551658 is about 372.1752989273.

The spelling of 51551658 in words is "fifty-one million, five hundred fifty-one thousand, six hundred fifty-eight".