6640265775 has 48 divisors (see below), whose sum is σ = 12897924480. Its totient is φ = 2971862400.

The previous prime is 6640265771. The next prime is 6640265783. The reversal of 6640265775 is 5775620466.

It is not a de Polignac number, because 6640265775 - 2² = 6640265771 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640265771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 298845 + ... + 320294.

It is an arithmetic number, because the mean of its divisors is an integer number (268706760).

Almost surely, 2^6640265775 is an apocalyptic number.

6640265775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6640265775 is a deficient number, since it is larger than the sum of its proper divisors (6257658705).

6640265775 is a wasteful number, since it uses less digits than its factorization.

6640265775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619176 (or 619171 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 48.

The square root of 6640265775 is about 81487.8259312396. The cubic root of 6640265775 is about 1879.5843519585.

The spelling of 6640265775 in words is "six billion, six hundred forty million, two hundred sixty-five thousand, seven hundred seventy-five".