50005661 has 4 divisors (see below), whose sum is σ = 50031900. Its totient is φ = 49979424.

The previous prime is 50005649. The next prime is 50005679. The reversal of 50005661 is 16650005.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31248100 + 18757561 = 5590^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 50005661 - 2²² = 45811357 is a prime.

It is a super-2 number, since 2×50005661² = 5001132264093842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50005961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10016 + ... + 14153.

It is an arithmetic number, because the mean of its divisors is an integer number (12507975).

Almost surely, 2^50005661 is an apocalyptic number.

It is an amenable number.

50005661 is a deficient number, since it is larger than the sum of its proper divisors (26239).

50005661 is a wasteful number, since it uses less digits than its factorization.

50005661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26238.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 50005661 is about 7071.4680936846. The cubic root of 50005661 is about 368.4170528742.

Adding to 50005661 its reverse (16650005), we get a palindrome (66655666).

The spelling of 50005661 in words is "fifty million, five thousand, six hundred sixty-one".