2640664042664 has 8 divisors (see below), whose sum is σ = 4951245080010. Its totient is φ = 1320332021328.

The previous prime is 2640664042663. The next prime is 2640664042729. The reversal of 2640664042664 is 4662404660462.

It can be written as a sum of positive squares in only one way, i.e., 2441275001764 + 199389040900 = 1562458^2 + 446530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×2640664042664² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2640664042663) 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 as a sum of consecutive naturals, namely, 165041502659 + ... + 165041502674.

Almost surely, 2^{2640664042664} is an apocalyptic number.

It is an amenable number.

2640664042664 is a deficient number, since it is larger than the sum of its proper divisors (2310581037346).

2640664042664 is a wasteful number, since it uses less digits than its factorization.

2640664042664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330083005339 (or 330083005335 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 2640664042664 in words is "two trillion, six hundred forty billion, six hundred sixty-four million, forty-two thousand, six hundred sixty-four".