61511050213 has 8 divisors (see below), whose sum is σ = 63757150200. Its totient is φ = 59273285568.

The previous prime is 61511050187. The next prime is 61511050261. The reversal of 61511050213 is 31205011516.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 38309058529 + 23201991684 = 195727^2 + 152322^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61511050213 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 (61511050273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2068806 + ... + 2098327.

It is an arithmetic number, because the mean of its divisors is an integer number (7969643775).

Almost surely, 2^61511050213 is an apocalyptic number.

It is an amenable number.

61511050213 is a deficient number, since it is larger than the sum of its proper divisors (2246099987).

61511050213 is a wasteful number, since it uses less digits than its factorization.

61511050213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167671.

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 61511050213 its reverse (31205011516), we get a palindrome (92716061729).

The spelling of 61511050213 in words is "sixty-one billion, five hundred eleven million, fifty thousand, two hundred thirteen".