61310553666 has 16 divisors (see below), whose sum is σ = 122626454688. Its totient is φ = 20435960000.

The previous prime is 61310553641. The next prime is 61310553679. The reversal of 61310553666 is 66635501316.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65175 + ... + 356186.

It is an arithmetic number, because the mean of its divisors is an integer number (7664153418).

Almost surely, 2^61310553666 is an apocalyptic number.

61310553666 is an abundant number, since it is smaller than the sum of its proper divisors (61315901022).

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

61310553666 is a wasteful number, since it uses less digits than its factorization.

61310553666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445617.

The product of its (nonzero) digits is 291600, while the sum is 42.

The spelling of 61310553666 in words is "sixty-one billion, three hundred ten million, five hundred fifty-three thousand, six hundred sixty-six".