61061655561 has 8 divisors (see below), whose sum is σ = 81416812800. Its totient is φ = 40707134352.

The previous prime is 61061655527. The next prime is 61061655563. The reversal of 61061655561 is 16555616016.

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

It is not a de Polignac number, because 61061655561 - 2⁷ = 61061655433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61061655563) 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, 151791 + ... + 381003.

It is an arithmetic number, because the mean of its divisors is an integer number (10177101600).

Almost surely, 2^61061655561 is an apocalyptic number.

It is an amenable number.

61061655561 is a deficient number, since it is larger than the sum of its proper divisors (20355157239).

61061655561 is a wasteful number, since it uses less digits than its factorization.

61061655561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318015.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 61061655561 in words is "sixty-one billion, sixty-one million, six hundred fifty-five thousand, five hundred sixty-one".