10565151721 has 4 divisors (see below), whose sum is σ = 11186631252. Its totient is φ = 9943672192.

The previous prime is 10565151719. The next prime is 10565151829. The reversal of 10565151721 is 12715156501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7286329600 + 3278822121 = 85360^2 + 57261^2 .

It is a cyclic number.

It is not a de Polignac number, because 10565151721 - 2¹ = 10565151719 is a prime.

It is a super-2 number, since 2×10565151721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10565155721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310739740 + ... + 310739773.

It is an arithmetic number, because the mean of its divisors is an integer number (2796657813).

Almost surely, 2^10565151721 is an apocalyptic number.

It is an amenable number.

10565151721 is a deficient number, since it is larger than the sum of its proper divisors (621479531).

10565151721 is an equidigital number, since it uses as much as digits as its factorization.

10565151721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621479530.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 10565151721 in words is "ten billion, five hundred sixty-five million, one hundred fifty-one thousand, seven hundred twenty-one".