61136363561 has 32 divisors (see below), whose sum is σ = 76822905600. Its totient is φ = 48344833152.

The previous prime is 61136363461. The next prime is 61136363597. The reversal of 61136363561 is 16536363116.

It is a de Polignac number, because none of the positive numbers 2^k-61136363561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61136363261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13165106 + ... + 13169748.

It is an arithmetic number, because the mean of its divisors is an integer number (2400715800).

Almost surely, 2^61136363561 is an apocalyptic number.

It is an amenable number.

61136363561 is a deficient number, since it is larger than the sum of its proper divisors (15686542039).

61136363561 is a wasteful number, since it uses less digits than its factorization.

61136363561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7630 (or 7616 counting only the distinct ones).

The product of its digits is 174960, while the sum is 41.

The spelling of 61136363561 in words is "sixty-one billion, one hundred thirty-six million, three hundred sixty-three thousand, five hundred sixty-one".