7273561665 has 16 divisors (see below), whose sum is σ = 12250209600. Its totient is φ = 3675062592.

The previous prime is 7273561637. The next prime is 7273561693. The reversal of 7273561665 is 5661653727.

It is an interprime number because it is at equal distance from previous prime (7273561637) and next prime (7273561693).

It is not a de Polignac number, because 7273561665 - 2⁸ = 7273561409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12760350 + ... + 12760919.

It is an arithmetic number, because the mean of its divisors is an integer number (765638100).

Almost surely, 2^7273561665 is an apocalyptic number.

It is an amenable number.

7273561665 is a deficient number, since it is larger than the sum of its proper divisors (4976647935).

7273561665 is a wasteful number, since it uses less digits than its factorization.

7273561665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25521296.

The product of its digits is 1587600, while the sum is 48.

The square root of 7273561665 is about 85285.1784602694. The cubic root of 7273561665 is about 1937.5327036589.

The spelling of 7273561665 in words is "seven billion, two hundred seventy-three million, five hundred sixty-one thousand, six hundred sixty-five".