2145326564555 has 4 divisors (see below), whose sum is σ = 2574391877472. Its totient is φ = 1716261251640.

The previous prime is 2145326564533. The next prime is 2145326564561. The reversal of 2145326564555 is 5554656235412.

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

It is a de Polignac number, because none of the positive numbers 2^k-2145326564555 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145326564497 and 2145326564506.

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, 214532656451 + ... + 214532656460.

It is an arithmetic number, because the mean of its divisors is an integer number (643597969368).

Almost surely, 2^{2145326564555} is an apocalyptic number.

2145326564555 is a deficient number, since it is larger than the sum of its proper divisors (429065312917).

2145326564555 is an equidigital number, since it uses as much as digits as its factorization.

2145326564555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429065312916.

The product of its digits is 21600000, while the sum is 53.

The spelling of 2145326564555 in words is "two trillion, one hundred forty-five billion, three hundred twenty-six million, five hundred sixty-four thousand, five hundred fifty-five".