50215661 has 4 divisors (see below), whose sum is σ = 50289024. Its totient is φ = 50142300.

The previous prime is 50215657. The next prime is 50215681. The reversal of 50215661 is 16651205.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 50215661 - 2² = 50215657 is a prime.

It is a super-3 number, since 3×50215661³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 50215661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50215681) 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, 35645 + ... + 37026.

It is an arithmetic number, because the mean of its divisors is an integer number (12572256).

Almost surely, 2^50215661 is an apocalyptic number.

It is an amenable number.

50215661 is a deficient number, since it is larger than the sum of its proper divisors (73363).

50215661 is an equidigital number, since it uses as much as digits as its factorization.

50215661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73362.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 50215661 is about 7086.3009391360. The cubic root of 50215661 is about 368.9320581035.

Adding to 50215661 its reverse (16651205), we get a palindrome (66866866).

The spelling of 50215661 in words is "fifty million, two hundred fifteen thousand, six hundred sixty-one".