61560056661 has 8 divisors (see below), whose sum is σ = 82102437120. Its totient is φ = 41028856992.

The previous prime is 61560056629. The next prime is 61560056687. The reversal of 61560056661 is 16665006516.

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

It is not a de Polignac number, because 61560056661 - 2⁵ = 61560056629 is a prime.

It is a super-2 number, since 2×61560056661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61560056161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2782341 + ... + 2804378.

It is an arithmetic number, because the mean of its divisors is an integer number (10262804640).

Almost surely, 2^61560056661 is an apocalyptic number.

It is an amenable number.

61560056661 is a deficient number, since it is larger than the sum of its proper divisors (20542380459).

61560056661 is a wasteful number, since it uses less digits than its factorization.

61560056661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590395.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 61560056661 in words is "sixty-one billion, five hundred sixty million, fifty-six thousand, six hundred sixty-one".