61135413661 has 4 divisors (see below), whose sum is σ = 69869044192. Its totient is φ = 52401783132.

The previous prime is 61135413637. The next prime is 61135413737. The reversal of 61135413661 is 16631453116.

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 a cyclic number.

It is not a de Polignac number, because 61135413661 - 2⁵ = 61135413629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61135413661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61135413601) 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, 4366815255 + ... + 4366815268.

It is an arithmetic number, because the mean of its divisors is an integer number (17467261048).

Almost surely, 2^61135413661 is an apocalyptic number.

It is an amenable number.

61135413661 is a deficient number, since it is larger than the sum of its proper divisors (8733630531).

61135413661 is an equidigital number, since it uses as much as digits as its factorization.

61135413661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8733630530.

The product of its digits is 38880, while the sum is 37.

Adding to 61135413661 its reverse (16631453116), we get a palindrome (77766866777).

The spelling of 61135413661 in words is "sixty-one billion, one hundred thirty-five million, four hundred thirteen thousand, six hundred sixty-one".