2180618381 has 8 divisors (see below), whose sum is σ = 2235084384. Its totient is φ = 2126797200.

The previous prime is 2180618329. The next prime is 2180618389. The reversal of 2180618381 is 1838160812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2180618381 - 2³⁰ = 1106876557 is a prime.

It is a super-2 number, since 2×2180618381² = 9510193047110122322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180618389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154355 + ... + 167888.

It is an arithmetic number, because the mean of its divisors is an integer number (279385548).

Almost surely, 2^2180618381 is an apocalyptic number.

It is an amenable number.

2180618381 is a deficient number, since it is larger than the sum of its proper divisors (54466003).

2180618381 is a wasteful number, since it uses less digits than its factorization.

2180618381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322411.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 2180618381 is about 46697.0917831079. The cubic root of 2180618381 is about 1296.7608472890.

The spelling of 2180618381 in words is "two billion, one hundred eighty million, six hundred eighteen thousand, three hundred eighty-one".