2640450330655 has 4 divisors (see below), whose sum is σ = 3168540396792. Its totient is φ = 2112360264520.

The previous prime is 2640450330619. The next prime is 2640450330659. The reversal of 2640450330655 is 5560330540462.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2640450330655 - 2⁹ = 2640450330143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640450330659) 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, 264045033061 + ... + 264045033070.

It is an arithmetic number, because the mean of its divisors is an integer number (792135099198).

Almost surely, 2^{2640450330655} is an apocalyptic number.

2640450330655 is a deficient number, since it is larger than the sum of its proper divisors (528090066137).

2640450330655 is an equidigital number, since it uses as much as digits as its factorization.

2640450330655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528090066136.

The product of its (nonzero) digits is 1296000, while the sum is 43.

The spelling of 2640450330655 in words is "two trillion, six hundred forty billion, four hundred fifty million, three hundred thirty thousand, six hundred fifty-five".