2721311762065 has 8 divisors (see below), whose sum is σ = 3516772123368. Its totient is φ = 2009584070400.

The previous prime is 2721311762023. The next prime is 2721311762101. The reversal of 2721311762065 is 5602671131272.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 201104711809 + 2520207050256 = 448447^2 + 1587516^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-2721311762065 is a prime.

It is a Duffinian number.

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, 20933167336 + ... + 20933167465.

It is an arithmetic number, because the mean of its divisors is an integer number (439596515421).

Almost surely, 2^{2721311762065} is an apocalyptic number.

It is an amenable number.

2721311762065 is a deficient number, since it is larger than the sum of its proper divisors (795460361303).

2721311762065 is a wasteful number, since it uses less digits than its factorization.

2721311762065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41866334819.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 2721311762065 in words is "two trillion, seven hundred twenty-one billion, three hundred eleven million, seven hundred sixty-two thousand, sixty-five".