2640357726463 has 4 divisors (see below), whose sum is σ = 2640692677608. Its totient is φ = 2640022775320.

The previous prime is 2640357726439. The next prime is 2640357726493. The reversal of 2640357726463 is 3646277530462.

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

It is a cyclic number.

It is not a de Polignac number, because 2640357726463 - 2¹⁷ = 2640357595391 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 (2640357726403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167463748 + ... + 167479513.

It is an arithmetic number, because the mean of its divisors is an integer number (660173169402).

Almost surely, 2^{2640357726463} is an apocalyptic number.

2640357726463 is a deficient number, since it is larger than the sum of its proper divisors (334951145).

2640357726463 is an equidigital number, since it uses as much as digits as its factorization.

2640357726463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334951144.

The product of its (nonzero) digits is 30481920, while the sum is 55.

The spelling of 2640357726463 in words is "two trillion, six hundred forty billion, three hundred fifty-seven million, seven hundred twenty-six thousand, four hundred sixty-three".