1720012565 has 8 divisors (see below), whose sum is σ = 2153755008. Its totient is φ = 1316183440.

The previous prime is 1720012561. The next prime is 1720012571. The reversal of 1720012565 is 5652100271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1720012565 - 2² = 1720012561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720012561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7478201 + ... + 7478430.

It is an arithmetic number, because the mean of its divisors is an integer number (269219376).

Almost surely, 2^1720012565 is an apocalyptic number.

It is an amenable number.

1720012565 is a deficient number, since it is larger than the sum of its proper divisors (433742443).

1720012565 is a wasteful number, since it uses less digits than its factorization.

1720012565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14956659.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 1720012565 is about 41473.0341909053. The cubic root of 1720012565 is about 1198.1482005486.

The spelling of 1720012565 in words is "one billion, seven hundred twenty million, twelve thousand, five hundred sixty-five".