2111549128447 has 16 divisors (see below), whose sum is σ = 2370477187584. Its totient is φ = 1864406128000.

The previous prime is 2111549128439. The next prime is 2111549128459. The reversal of 2111549128447 is 7448219451112.

It is a cyclic number.

It is not a de Polignac number, because 2111549128447 - 2³ = 2111549128439 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2111549128447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117549128447) 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, 15520954 + ... + 15656407.

It is an arithmetic number, because the mean of its divisors is an integer number (148154824224).

Almost surely, 2^{2111549128447} is an apocalyptic number.

2111549128447 is a deficient number, since it is larger than the sum of its proper divisors (258928059137).

2111549128447 is a wasteful number, since it uses less digits than its factorization.

2111549128447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31177550.

The product of its digits is 645120, while the sum is 49.

The spelling of 2111549128447 in words is "two trillion, one hundred eleven billion, five hundred forty-nine million, one hundred twenty-eight thousand, four hundred forty-seven".