6642265919 has 2 divisors, whose sum is σ = 6642265920. Its totient is φ = 6642265918.

The previous prime is 6642265873. The next prime is 6642265951. The reversal of 6642265919 is 9195622466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6642265919 - 2²⁴ = 6625488703 is a prime.

It is a super-2 number, since 2×6642265919² = 88239393077417829122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642265999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321132959 + 3321132960.

It is an arithmetic number, because the mean of its divisors is an integer number (3321132960).

Almost surely, 2^6642265919 is an apocalyptic number.

6642265919 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642265919 is an equidigital number, since it uses as much as digits as its factorization.

6642265919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 50.

The square root of 6642265919 is about 81500.0976625182. The cubic root of 6642265919 is about 1879.7730523353.

The spelling of 6642265919 in words is "six billion, six hundred forty-two million, two hundred sixty-five thousand, nine hundred nineteen".