51807661 has 16 divisors (see below), whose sum is σ = 57507840. Its totient is φ = 46450800.

The previous prime is 51807629. The next prime is 51807671. The reversal of 51807661 is 16670815.

51807661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51807661 - 2⁵ = 51807629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51807611) 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 15 ways as a sum of consecutive naturals, for example, 44436 + ... + 45586.

It is an arithmetic number, because the mean of its divisors is an integer number (3594240).

Almost surely, 2^51807661 is an apocalyptic number.

It is an amenable number.

51807661 is a deficient number, since it is larger than the sum of its proper divisors (5700179).

51807661 is a wasteful number, since it uses less digits than its factorization.

51807661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 51807661 is about 7197.7538857619. The cubic root of 51807661 is about 372.7903500245.

The spelling of 51807661 in words is "fifty-one million, eight hundred seven thousand, six hundred sixty-one".