61310685561 has 8 divisors (see below), whose sum is σ = 81757324320. Its totient is φ = 40868918592.

The previous prime is 61310685551. The next prime is 61310685619. The reversal of 61310685561 is 16558601316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61310685561 - 2⁵ = 61310685529 is a prime.

It is a super-3 number, since 3×61310685561³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61310685551) 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 7 ways as a sum of consecutive naturals, for example, 1188480 + ... + 1238993.

It is an arithmetic number, because the mean of its divisors is an integer number (10219665540).

Almost surely, 2^61310685561 is an apocalyptic number.

It is an amenable number.

61310685561 is a deficient number, since it is larger than the sum of its proper divisors (20446638759).

61310685561 is a wasteful number, since it uses less digits than its factorization.

61310685561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435895.

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 61310685561 in words is "sixty-one billion, three hundred ten million, six hundred eighty-five thousand, five hundred sixty-one".