1720661250265 has 8 divisors (see below), whose sum is σ = 2173466842560. Its totient is φ = 1304080105392.

The previous prime is 1720661250241. The next prime is 1720661250293. The reversal of 1720661250265 is 5620521660271.

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

It is a cyclic number.

It is not a de Polignac number, because 1720661250265 - 2⁷ = 1720661250137 is a prime.

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, 9056111749 + ... + 9056111938.

It is an arithmetic number, because the mean of its divisors is an integer number (271683355320).

Almost surely, 2^{1720661250265} is an apocalyptic number.

It is an amenable number.

1720661250265 is a deficient number, since it is larger than the sum of its proper divisors (452805592295).

1720661250265 is a wasteful number, since it uses less digits than its factorization.

1720661250265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18112223711.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 1720661250265 in words is "one trillion, seven hundred twenty billion, six hundred sixty-one million, two hundred fifty thousand, two hundred sixty-five".