2155444305613 has 4 divisors (see below), whose sum is σ = 2156202466848. Its totient is φ = 2154686144380.

The previous prime is 2155444305587. The next prime is 2155444305617. The reversal of 2155444305613 is 3165034445512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2155444305613 - 2³³ = 2146854371021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155444305613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155444305617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379076353 + ... + 379082038.

It is an arithmetic number, because the mean of its divisors is an integer number (539050616712).

Almost surely, 2^{2155444305613} is an apocalyptic number.

It is an amenable number.

2155444305613 is a deficient number, since it is larger than the sum of its proper divisors (758161235).

2155444305613 is an equidigital number, since it uses as much as digits as its factorization.

2155444305613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758161234.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 2155444305613 in words is "two trillion, one hundred fifty-five billion, four hundred forty-four million, three hundred five thousand, six hundred thirteen".