51708661 has 8 divisors (see below), whose sum is σ = 53659584. Its totient is φ = 49791840.

The previous prime is 51708649. The next prime is 51708677. The reversal of 51708661 is 16680715.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51708661 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 (51708641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5416 + ... + 11521.

It is an arithmetic number, because the mean of its divisors is an integer number (6707448).

Almost surely, 2^51708661 is an apocalyptic number.

It is an amenable number.

51708661 is a deficient number, since it is larger than the sum of its proper divisors (1950923).

51708661 is a wasteful number, since it uses less digits than its factorization.

51708661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17051.

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

The square root of 51708661 is about 7190.8734518138. The cubic root of 51708661 is about 372.5527418076.

It can be divided in two parts, 5170 and 8661, that added together give a palindrome (13831).

The spelling of 51708661 in words is "fifty-one million, seven hundred eight thousand, six hundred sixty-one".