2664049906621 has 2 divisors, whose sum is σ = 2664049906622. Its totient is φ = 2664049906620.

The previous prime is 2664049906589. The next prime is 2664049906627. The reversal of 2664049906621 is 1266099404662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2393843312025 + 270206594596 = 1547205^2 + 519814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2664049906621 - 2⁵ = 2664049906589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2664049906627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332024953310 + 1332024953311.

It is an arithmetic number, because the mean of its divisors is an integer number (1332024953311).

Almost surely, 2^{2664049906621} is an apocalyptic number.

It is an amenable number.

2664049906621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2664049906621 is an equidigital number, since it uses as much as digits as its factorization.

2664049906621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 55.

The spelling of 2664049906621 in words is "two trillion, six hundred sixty-four billion, forty-nine million, nine hundred six thousand, six hundred twenty-one".