61560666016660 has 12 divisors (see below), whose sum is σ = 129277398635028. Its totient is φ = 24624266406656.

The previous prime is 61560666016639. The next prime is 61560666016753. The reversal of 61560666016660 is 6661066606516.

It can be written as a sum of positive squares in 2 ways, for example, as 8280973118224 + 53279692898436 = 2877668^2 + 7299294^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539016650397 + ... + 1539016650436.

It is an arithmetic number, because the mean of its divisors is an integer number (10773116552919).

Almost surely, 2^{61560666016660} is an apocalyptic number.

It is an amenable number.

61560666016660 is an abundant number, since it is smaller than the sum of its proper divisors (67716732618368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61560666016660 is a wasteful number, since it uses less digits than its factorization.

61560666016660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078033300842 (or 3078033300840 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 61560666016660 in words is "sixty-one trillion, five hundred sixty billion, six hundred sixty-six million, sixteen thousand, six hundred sixty".