51646661 has 8 divisors (see below), whose sum is σ = 58791744. Its totient is φ = 44909920.

The previous prime is 51646657. The next prime is 51646717. The reversal of 51646661 is 16664615.

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

It is not a de Polignac number, because 51646661 - 2² = 51646657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51646601) 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, 101816 + ... + 102321.

It is an arithmetic number, because the mean of its divisors is an integer number (7348968).

Almost surely, 2^51646661 is an apocalyptic number.

It is an amenable number.

51646661 is a deficient number, since it is larger than the sum of its proper divisors (7145083).

51646661 is a wasteful number, since it uses less digits than its factorization.

51646661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204171.

The product of its digits is 25920, while the sum is 35.

The square root of 51646661 is about 7186.5611386810. The cubic root of 51646661 is about 372.4037821845.

The spelling of 51646661 in words is "fifty-one million, six hundred forty-six thousand, six hundred sixty-one".