2161310455555 has 4 divisors (see below), whose sum is σ = 2593572546672. Its totient is φ = 1729048364440.

The previous prime is 2161310455541. The next prime is 2161310455609. The reversal of 2161310455555 is 5555540131612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2161310455555 - 2⁹ = 2161310455043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216131045551 + ... + 216131045560.

It is an arithmetic number, because the mean of its divisors is an integer number (648393136668).

Almost surely, 2^{2161310455555} is an apocalyptic number.

2161310455555 is a deficient number, since it is larger than the sum of its proper divisors (432262091117).

2161310455555 is an equidigital number, since it uses as much as digits as its factorization.

2161310455555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432262091116.

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 2161310455555 in words is "two trillion, one hundred sixty-one billion, three hundred ten million, four hundred fifty-five thousand, five hundred fifty-five".