5311216661 has 4 divisors (see below), whose sum is σ = 5590754400. Its totient is φ = 5031678924.

The previous prime is 5311216633. The next prime is 5311216693. The reversal of 5311216661 is 1666121135.

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 5311216661 - 2⁶ = 5311216597 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 (5311206661) 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, 139768841 + ... + 139768878.

It is an arithmetic number, because the mean of its divisors is an integer number (1397688600).

Almost surely, 2^5311216661 is an apocalyptic number.

It is an amenable number.

5311216661 is a deficient number, since it is larger than the sum of its proper divisors (279537739).

5311216661 is a wasteful number, since it uses less digits than its factorization.

5311216661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279537738.

The product of its digits is 6480, while the sum is 32.

The square root of 5311216661 is about 72878.0945209190. The cubic root of 5311216661 is about 1744.7424967934.

Adding to 5311216661 its reverse (1666121135), we get a palindrome (6977337796).

The spelling of 5311216661 in words is "five billion, three hundred eleven million, two hundred sixteen thousand, six hundred sixty-one".