5109616661 has 4 divisors (see below), whose sum is σ = 5109766092. Its totient is φ = 5109467232.

The previous prime is 5109616651. The next prime is 5109616693. The reversal of 5109616661 is 1666169015.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4183631761 + 925984900 = 64681^2 + 30430^2 .

It is a cyclic number.

It is not a de Polignac number, because 5109616661 - 2²⁶ = 5042507797 is a prime.

It is a super-2 number, since 2×5109616661² = 52216364844737577842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5109616651) 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, 4745 + ... + 101201.

It is an arithmetic number, because the mean of its divisors is an integer number (1277441523).

Almost surely, 2^5109616661 is an apocalyptic number.

It is an amenable number.

5109616661 is a deficient number, since it is larger than the sum of its proper divisors (149431).

5109616661 is an equidigital number, since it uses as much as digits as its factorization.

5109616661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149430.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 5109616661 is about 71481.5826699437. The cubic root of 5109616661 is about 1722.3818475962.

The spelling of 5109616661 in words is "five billion, one hundred nine million, six hundred sixteen thousand, six hundred sixty-one".