2105620665554 has 16 divisors (see below), whose sum is σ = 3609678408000. Its totient is φ = 902398111344.

The previous prime is 2105620665521. The next prime is 2105620665679. The reversal of 2105620665554 is 4555660265012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2105620665499 and 2105620665508.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385472 + ... + 2088020.

It is an arithmetic number, because the mean of its divisors is an integer number (225604900500).

Almost surely, 2^{2105620665554} is an apocalyptic number.

2105620665554 is a deficient number, since it is larger than the sum of its proper divisors (1504057742446).

2105620665554 is a wasteful number, since it uses less digits than its factorization.

2105620665554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790897.

The product of its (nonzero) digits is 2160000, while the sum is 47.

The spelling of 2105620665554 in words is "two trillion, one hundred five billion, six hundred twenty million, six hundred sixty-five thousand, five hundred fifty-four".