61611006661 has 8 divisors (see below), whose sum is σ = 62033391000. Its totient is φ = 61188741120.

The previous prime is 61611006577. The next prime is 61611006679. The reversal of 61611006661 is 16660011616.

61611006661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1644302500 + 59966704161 = 40550^2 + 244881^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 61611006661 - 2⁷ = 61611006533 is a prime.

It is a super-2 number, since 2×61611006661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61611006461) 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, 1178485 + ... + 1229653.

It is an arithmetic number, because the mean of its divisors is an integer number (7754173875).

Almost surely, 2^61611006661 is an apocalyptic number.

It is an amenable number.

61611006661 is a deficient number, since it is larger than the sum of its proper divisors (422384339).

61611006661 is a wasteful number, since it uses less digits than its factorization.

61611006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59399.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 61611006661 in words is "sixty-one billion, six hundred eleven million, six thousand, six hundred sixty-one".