2656203661645 has 8 divisors (see below), whose sum is σ = 3188069291160. Its totient is φ = 2124546331200.

The previous prime is 2656203661633. The next prime is 2656203661667. The reversal of 2656203661645 is 5461663026562.

It can be written as a sum of positive squares in 4 ways, for example, as 265895953801 + 2390307707844 = 515651^2 + 1546062^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2656203661645 - 2¹⁷ = 2656203530573 is a prime.

It is a super-3 number, since 3×2656203661645³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2656203661592 and 2656203661601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52046710 + ... + 52097719.

It is an arithmetic number, because the mean of its divisors is an integer number (398508661395).

Almost surely, 2^{2656203661645} is an apocalyptic number.

It is an amenable number.

2656203661645 is a deficient number, since it is larger than the sum of its proper divisors (531865629515).

2656203661645 is a wasteful number, since it uses less digits than its factorization.

2656203661645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104149535.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 2656203661645 in words is "two trillion, six hundred fifty-six billion, two hundred three million, six hundred sixty-one thousand, six hundred forty-five".