2170743561 has 72 divisors (see below), whose sum is σ = 3716500320. Its totient is φ = 1217212416.

The previous prime is 2170743557. The next prime is 2170743581. The reversal of 2170743561 is 1653470712.

It is a happy number.

2170743561 is a `hidden beast` number, since 21 + 7 + 0 + 74 + 3 + 561 = 666.

It is not a de Polignac number, because 2170743561 - 2² = 2170743557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2170743511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8446345 + ... + 8446601.

It is an arithmetic number, because the mean of its divisors is an integer number (51618060).

Almost surely, 2^2170743561 is an apocalyptic number.

2170743561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2170743561 is a deficient number, since it is larger than the sum of its proper divisors (1545756759).

2170743561 is a wasteful number, since it uses less digits than its factorization.

2170743561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 2170743561 is about 46591.2391013590. The cubic root of 2170743561 is about 1294.8004464853.

The spelling of 2170743561 in words is "two billion, one hundred seventy million, seven hundred forty-three thousand, five hundred sixty-one".