1720467665 has 24 divisors (see below), whose sum is σ = 2452747392. Its totient is φ = 1154640480.

The previous prime is 1720467647. The next prime is 1720467673. The reversal of 1720467665 is 5667640271.

It is not a de Polignac number, because 1720467665 - 2¹⁴ = 1720451281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63191 + ... + 86220.

It is an arithmetic number, because the mean of its divisors is an integer number (102197808).

Almost surely, 2^1720467665 is an apocalyptic number.

It is an amenable number.

1720467665 is a deficient number, since it is larger than the sum of its proper divisors (732279727).

1720467665 is a wasteful number, since it uses less digits than its factorization.

1720467665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149477 (or 149470 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 1720467665 is about 41478.5205256890. The cubic root of 1720467665 is about 1198.2538643428.

The spelling of 1720467665 in words is "one billion, seven hundred twenty million, four hundred sixty-seven thousand, six hundred sixty-five".