2155643265442 has 16 divisors (see below), whose sum is σ = 3424152735360. Its totient is φ = 1014276947008.

The previous prime is 2155643265437. The next prime is 2155643265467. The reversal of 2155643265442 is 2445623465512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4237438 + ... + 4718809.

It is an arithmetic number, because the mean of its divisors is an integer number (214009545960).

Almost surely, 2^{2155643265442} is an apocalyptic number.

2155643265442 is a deficient number, since it is larger than the sum of its proper divisors (1268509469918).

2155643265442 is a wasteful number, since it uses less digits than its factorization.

2155643265442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8963345.

The product of its digits is 6912000, while the sum is 49.

The spelling of 2155643265442 in words is "two trillion, one hundred fifty-five billion, six hundred forty-three million, two hundred sixty-five thousand, four hundred forty-two".