50018815861 has 4 divisors (see below), whose sum is σ = 57164360992. Its totient is φ = 42873270732.

The previous prime is 50018815849. The next prime is 50018815867. The reversal of 50018815861 is 16851881005.

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 50018815861 - 2²⁹ = 49481944949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50018815867) 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, 3572772555 + ... + 3572772568.

It is an arithmetic number, because the mean of its divisors is an integer number (14291090248).

Almost surely, 2^50018815861 is an apocalyptic number.

It is an amenable number.

50018815861 is a deficient number, since it is larger than the sum of its proper divisors (7145545131).

50018815861 is an equidigital number, since it uses as much as digits as its factorization.

50018815861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7145545130.

The product of its (nonzero) digits is 76800, while the sum is 43.

The spelling of 50018815861 in words is "fifty billion, eighteen million, eight hundred fifteen thousand, eight hundred sixty-one".