1205170155220 has 24 divisors (see below), whose sum is σ = 2612497886208. Its totient is φ = 466517479200.

The previous prime is 1205170155199. The next prime is 1205170155247. The reversal of 1205170155220 is 225510715021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent 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, 971910796 + ... + 971912035.

It is an arithmetic number, because the mean of its divisors is an integer number (108854078592).

Almost surely, 2^{1205170155220} is an apocalyptic number.

1205170155220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205170155220 is an abundant number, since it is smaller than the sum of its proper divisors (1407327730988).

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

1205170155220 is a wasteful number, since it uses less digits than its factorization.

1205170155220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943822871 (or 1943822869 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 31.

The spelling of 1205170155220 in words is "one trillion, two hundred five billion, one hundred seventy million, one hundred fifty-five thousand, two hundred twenty".