1720172465 has 16 divisors (see below), whose sum is σ = 2280372480. Its totient is φ = 1235195520.

The previous prime is 1720172459. The next prime is 1720172471. The reversal of 1720172465 is 5642710271.

It is an interprime number because it is at equal distance from previous prime (1720172459) and next prime (1720172471).

It is not a de Polignac number, because 1720172465 - 2¹⁶ = 1720106929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193604 + ... + 202293.

It is an arithmetic number, because the mean of its divisors is an integer number (142523280).

Almost surely, 2^1720172465 is an apocalyptic number.

It is an amenable number.

1720172465 is a deficient number, since it is larger than the sum of its proper divisors (560200015).

1720172465 is a wasteful number, since it uses less digits than its factorization.

1720172465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395992.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 1720172465 is about 41474.9619047444. The cubic root of 1720172465 is about 1198.1853277891.

The spelling of 1720172465 in words is "one billion, seven hundred twenty million, one hundred seventy-two thousand, four hundred sixty-five".