2661604305550 has 48 divisors (see below), whose sum is σ = 5242042693152. Its totient is φ = 1001968358400.

The previous prime is 2661604305541. The next prime is 2661604305587. The reversal of 2661604305550 is 555034061662.

It is a junction number, because it is equal to n+sod(n) for n = 2661604305497 and 2661604305506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21665599 + ... + 21788101.

It is an arithmetic number, because the mean of its divisors is an integer number (109209222774).

Almost surely, 2^{2661604305550} is an apocalyptic number.

2661604305550 is a deficient number, since it is larger than the sum of its proper divisors (2580438387602).

2661604305550 is a wasteful number, since it uses less digits than its factorization.

2661604305550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148093 (or 148088 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 2661604305550 in words is "two trillion, six hundred sixty-one billion, six hundred four million, three hundred five thousand, five hundred fifty".