2155081645 has 8 divisors (see below), whose sum is σ = 2591045856. Its totient is φ = 1720766736.

The previous prime is 2155081609. The next prime is 2155081657. The reversal of 2155081645 is 5461805512.

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 2155081645 - 2⁹ = 2155081133 is a prime.

It is a super-3 number, since 3×2155081645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409447 + ... + 414676.

It is an arithmetic number, because the mean of its divisors is an integer number (323880732).

Almost surely, 2^2155081645 is an apocalyptic number.

It is an amenable number.

2155081645 is a deficient number, since it is larger than the sum of its proper divisors (435964211).

2155081645 is an equidigital number, since it uses as much as digits as its factorization.

2155081645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824651.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 2155081645 is about 46422.8569241489. The cubic root of 2155081645 is about 1291.6789318479.

The spelling of 2155081645 in words is "two billion, one hundred fifty-five million, eighty-one thousand, six hundred forty-five".