61961161199 has 4 divisors (see below), whose sum is σ = 70812755664. Its totient is φ = 53109566736.

The previous prime is 61961161187. The next prime is 61961161219. The reversal of 61961161199 is 99116116916.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61961161199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61961161109) 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, 4425797222 + ... + 4425797235.

It is an arithmetic number, because the mean of its divisors is an integer number (17703188916).

Almost surely, 2^61961161199 is an apocalyptic number.

61961161199 is a deficient number, since it is larger than the sum of its proper divisors (8851594465).

61961161199 is an equidigital number, since it uses as much as digits as its factorization.

61961161199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8851594464.

The product of its digits is 157464, while the sum is 50.

The spelling of 61961161199 in words is "sixty-one billion, nine hundred sixty-one million, one hundred sixty-one thousand, one hundred ninety-nine".