2105620665555 has 64 divisors (see below), whose sum is σ = 3695591757312. Its totient is φ = 1015264419840.

The previous prime is 2105620665521. The next prime is 2105620665679. The reversal of 2105620665555 is 5555660265012.

It is not a de Polignac number, because 2105620665555 - 2⁷ = 2105620665427 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 107403384 + ... + 107422986.

It is an arithmetic number, because the mean of its divisors is an integer number (57743621208).

Almost surely, 2^{2105620665555} is an apocalyptic number.

2105620665555 is a deficient number, since it is larger than the sum of its proper divisors (1589971091757).

2105620665555 is a wasteful number, since it uses less digits than its factorization.

2105620665555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23188.

The product of its (nonzero) digits is 2700000, while the sum is 48.

The spelling of 2105620665555 in words is "two trillion, one hundred five billion, six hundred twenty million, six hundred sixty-five thousand, five hundred fifty-five".