10005111661 has 4 divisors (see below), whose sum is σ = 10011498112. Its totient is φ = 9998725212.

The previous prime is 10005111659. The next prime is 10005111671. The reversal of 10005111661 is 16611150001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10005111661 - 2¹ = 10005111659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10005111631) 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, 3190875 + ... + 3194008.

It is an arithmetic number, because the mean of its divisors is an integer number (2502874528).

Almost surely, 2^10005111661 is an apocalyptic number.

It is an amenable number.

10005111661 is a deficient number, since it is larger than the sum of its proper divisors (6386451).

10005111661 is an equidigital number, since it uses as much as digits as its factorization.

10005111661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6386450.

The product of its (nonzero) digits is 180, while the sum is 22.

Adding to 10005111661 its reverse (16611150001), we get a palindrome (26616261662).

The spelling of 10005111661 in words is "ten billion, five million, one hundred eleven thousand, six hundred sixty-one".