50666639 has 4 divisors (see below), whose sum is σ = 50696256. Its totient is φ = 50637024.

The previous prime is 50666633. The next prime is 50666641. The reversal of 50666639 is 93666605.

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

It is a cyclic number.

It is not a de Polignac number, because 50666639 - 2⁸ = 50666383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 50666596 and 50666605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50666633) 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, 12074 + ... + 15719.

It is an arithmetic number, because the mean of its divisors is an integer number (12674064).

Almost surely, 2^50666639 is an apocalyptic number.

50666639 is a deficient number, since it is larger than the sum of its proper divisors (29617).

50666639 is a wasteful number, since it uses less digits than its factorization.

50666639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29616.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 50666639 is about 7118.0502246050. The cubic root of 50666639 is about 370.0332061749.

The spelling of 50666639 in words is "fifty million, six hundred sixty-six thousand, six hundred thirty-nine".