2181467873554 has 4 divisors (see below), whose sum is σ = 3272201810334. Its totient is φ = 1090733936776.

The previous prime is 2181467873551. The next prime is 2181467873561. The reversal of 2181467873554 is 4553787641812.

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

It can be written as a sum of positive squares in only one way, i.e., 1937009815225 + 244458058329 = 1391765^2 + 494427^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2181467873492 and 2181467873501.

It is not an unprimeable number, because it can be changed into a prime (2181467873551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545366968387 + ... + 545366968390.

Almost surely, 2^{2181467873554} is an apocalyptic number.

2181467873554 is a deficient number, since it is larger than the sum of its proper divisors (1090733936780).

2181467873554 is a wasteful number, since it uses less digits than its factorization.

2181467873554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090733936779.

The product of its digits is 45158400, while the sum is 61.

The spelling of 2181467873554 in words is "two trillion, one hundred eighty-one billion, four hundred sixty-seven million, eight hundred seventy-three thousand, five hundred fifty-four".