2143561655 has 16 divisors (see below), whose sum is σ = 2630542944. Its totient is φ = 1676350080.

The previous prime is 2143561649. The next prime is 2143561657. The reversal of 2143561655 is 5561653412.

It is not a de Polignac number, because 2143561655 - 2¹⁸ = 2143299511 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143561657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28157 + ... + 71273.

It is an arithmetic number, because the mean of its divisors is an integer number (164408934).

Almost surely, 2^2143561655 is an apocalyptic number.

2143561655 is a deficient number, since it is larger than the sum of its proper divisors (486981289).

2143561655 is a wasteful number, since it uses less digits than its factorization.

2143561655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43346.

The product of its digits is 108000, while the sum is 38.

The square root of 2143561655 is about 46298.6139641350. The cubic root of 2143561655 is about 1289.3732618447.

The spelling of 2143561655 in words is "two billion, one hundred forty-three million, five hundred sixty-one thousand, six hundred fifty-five".