1205648355666 has 32 divisors (see below), whose sum is σ = 2548083418560. Its totient is φ = 379249606656.

The previous prime is 1205648355607. The next prime is 1205648355673. The reversal of 1205648355666 is 6665538465021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20546311 + ... + 20604906.

It is an arithmetic number, because the mean of its divisors is an integer number (79627606830).

Almost surely, 2^{1205648355666} is an apocalyptic number.

1205648355666 is an abundant number, since it is smaller than the sum of its proper divisors (1342435062894).

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

1205648355666 is a wasteful number, since it uses less digits than its factorization.

1205648355666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41151498.

The product of its (nonzero) digits is 31104000, while the sum is 57.

The spelling of 1205648355666 in words is "one trillion, two hundred five billion, six hundred forty-eight million, three hundred fifty-five thousand, six hundred sixty-six".