50396721660 has 144 divisors (see below), whose sum is σ = 154291178496. Its totient is φ = 13314502656.

The previous prime is 50396721643. The next prime is 50396721667. The reversal of 50396721660 is 6612769305.

50396721660 is a `hidden beast` number, since 503 + 9 + 6 + 72 + 16 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50396721667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24984972 + ... + 24986988.

Almost surely, 2^50396721660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50396721660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77145589248).

50396721660 is an abundant number, since it is smaller than the sum of its proper divisors (103894456836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

50396721660 is a wasteful number, since it uses less digits than its factorization.

50396721660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252 (or 3247 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 50396721660 in words is "fifty billion, three hundred ninety-six million, seven hundred twenty-one thousand, six hundred sixty".