6650712421 has 2 divisors, whose sum is σ = 6650712422. Its totient is φ = 6650712420.

The previous prime is 6650712413. The next prime is 6650712449. The reversal of 6650712421 is 1242170566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6518140225 + 132572196 = 80735^2 + 11514^2 .

It is a cyclic number.

It is not a de Polignac number, because 6650712421 - 2³ = 6650712413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6650712451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325356210 + 3325356211.

It is an arithmetic number, because the mean of its divisors is an integer number (3325356211).

Almost surely, 2^6650712421 is an apocalyptic number.

It is an amenable number.

6650712421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6650712421 is an equidigital number, since it uses as much as digits as its factorization.

6650712421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 6650712421 is about 81551.9001679299. The cubic root of 6650712421 is about 1880.5695065217.

Adding to 6650712421 its reverse (1242170566), we get a palindrome (7892882987).

The spelling of 6650712421 in words is "six billion, six hundred fifty million, seven hundred twelve thousand, four hundred twenty-one".