661541053050 has 144 divisors (see below), whose sum is σ = 1848161498040. Its totient is φ = 169444638720.

The previous prime is 661541053049. The next prime is 661541053051. The reversal of 661541053050 is 50350145166.

661541053050 is a `hidden beast` number, since 6 + 61 + 5 + 4 + 10 + 530 + 50 = 666.

661541053050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (661541053049) and next prime (661541053051).

It can be written as a sum of positive squares in 12 ways, for example, as 45672391521 + 615868661529 = 213711^2 + 784773^2 .

It is a junction number, because it is equal to n+sod(n) for n = 661541052996 and 661541053014.

It is not an unprimeable number, because it can be changed into a prime (661541053051) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2387322 + ... + 2649978.

Almost surely, 2^661541053050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661541053050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924080749020).

661541053050 is an abundant number, since it is smaller than the sum of its proper divisors (1186620444990).

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

661541053050 is a wasteful number, since it uses less digits than its factorization.

661541053050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262897 (or 262889 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 661541053050 in words is "six hundred sixty-one billion, five hundred forty-one million, fifty-three thousand, fifty".