5198666261 has 4 divisors (see below), whose sum is σ = 5204691072. Its totient is φ = 5192641452.

The previous prime is 5198666191. The next prime is 5198666269. The reversal of 5198666261 is 1626668915.

It is a happy number.

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 5198666261 - 2²² = 5194471957 is a prime.

It is a super-2 number, since 2×5198666261² = 54052261786519440242, 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 (5198666269) 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, 3011111 + ... + 3012836.

It is an arithmetic number, because the mean of its divisors is an integer number (1301172768).

Almost surely, 2^5198666261 is an apocalyptic number.

It is an amenable number.

5198666261 is a deficient number, since it is larger than the sum of its proper divisors (6024811).

5198666261 is an equidigital number, since it uses as much as digits as its factorization.

5198666261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6024810.

The product of its digits is 933120, while the sum is 50.

The square root of 5198666261 is about 72101.7771001520. Note that the first 3 decimals coincide. The cubic root of 5198666261 is about 1732.3300779037.

The spelling of 5198666261 in words is "five billion, one hundred ninety-eight million, six hundred sixty-six thousand, two hundred sixty-one".