50640421906 has 8 divisors (see below), whose sum is σ = 76444459020. Its totient is φ = 25158935568.

The previous prime is 50640421903. The next prime is 50640421939. The reversal of 50640421906 is 60912404605.

It can be written as a sum of positive squares in 2 ways, for example, as 49561890625 + 1078531281 = 222625^2 + 32841^2 .

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

It is not an unprimeable number, because it can be changed into a prime (50640421903) 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, 80637301 + ... + 80637928.

Almost surely, 2^50640421906 is an apocalyptic number.

50640421906 is a deficient number, since it is larger than the sum of its proper divisors (25804037114).

50640421906 is a wasteful number, since it uses less digits than its factorization.

50640421906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161275388.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 50640421906 in words is "fifty billion, six hundred forty million, four hundred twenty-one thousand, nine hundred six".