61641568195 has 4 divisors (see below), whose sum is σ = 73969881840. Its totient is φ = 49313254552.

The previous prime is 61641568189. The next prime is 61641568199. The reversal of 61641568195 is 59186514616.

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

It is a cyclic number.

It is not a de Polignac number, because 61641568195 - 2⁷ = 61641568067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61641568199) 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, 6164156815 + ... + 6164156824.

It is an arithmetic number, because the mean of its divisors is an integer number (18492470460).

Almost surely, 2^61641568195 is an apocalyptic number.

61641568195 is a deficient number, since it is larger than the sum of its proper divisors (12328313645).

61641568195 is a wasteful number, since it uses less digits than its factorization.

61641568195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12328313644.

The product of its digits is 1555200, while the sum is 52.

The spelling of 61641568195 in words is "sixty-one billion, six hundred forty-one million, five hundred sixty-eight thousand, one hundred ninety-five".