61133115513 has 4 divisors (see below), whose sum is σ = 81510820688. Its totient is φ = 40755410340.

The previous prime is 61133115499. The next prime is 61133115521. The reversal of 61133115513 is 31551133116.

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 not a de Polignac number, because 61133115513 - 2⁸ = 61133115257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61133115713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10188852583 + ... + 10188852588.

It is an arithmetic number, because the mean of its divisors is an integer number (20377705172).

Almost surely, 2^61133115513 is an apocalyptic number.

It is an amenable number.

61133115513 is a deficient number, since it is larger than the sum of its proper divisors (20377705175).

61133115513 is a wasteful number, since it uses less digits than its factorization.

61133115513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20377705174.

The product of its digits is 4050, while the sum is 30.

Adding to 61133115513 its reverse (31551133116), we get a palindrome (92684248629).

The spelling of 61133115513 in words is "sixty-one billion, one hundred thirty-three million, one hundred fifteen thousand, five hundred thirteen".