50661561 has 8 divisors (see below), whose sum is σ = 67695264. Its totient is φ = 33701120.

The previous prime is 50661539. The next prime is 50661563. The reversal of 50661561 is 16516605.

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

It is a cyclic number.

It is not a de Polignac number, because 50661561 - 2⁵ = 50661529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (50661563) 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, 16680 + ... + 19481.

It is an arithmetic number, because the mean of its divisors is an integer number (8461908).

Almost surely, 2^50661561 is an apocalyptic number.

It is an amenable number.

50661561 is a deficient number, since it is larger than the sum of its proper divisors (17033703).

50661561 is a wasteful number, since it uses less digits than its factorization.

50661561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36631.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 50661561 is about 7117.6935168635. The cubic root of 50661561 is about 370.0208437247.

The spelling of 50661561 in words is "fifty million, six hundred sixty-one thousand, five hundred sixty-one".