2155267645 has 8 divisors (see below), whose sum is σ = 2609209656. Its totient is φ = 1708955136.

The previous prime is 2155267613. The next prime is 2155267669. The reversal of 2155267645 is 5467625512.

It can be written as a sum of positive squares in 4 ways, for example, as 21104836 + 2134162809 = 4594^2 + 46197^2 .

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 2155267645 - 2⁵ = 2155267613 is a prime.

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, 1906752 + ... + 1907881.

It is an arithmetic number, because the mean of its divisors is an integer number (326151207).

Almost surely, 2^2155267645 is an apocalyptic number.

It is an amenable number.

2155267645 is a deficient number, since it is larger than the sum of its proper divisors (453942011).

2155267645 is a wasteful number, since it uses less digits than its factorization.

2155267645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814751.

The product of its digits is 504000, while the sum is 43.

The square root of 2155267645 is about 46424.8602044206. The cubic root of 2155267645 is about 1291.7160913635.

The spelling of 2155267645 in words is "two billion, one hundred fifty-five million, two hundred sixty-seven thousand, six hundred forty-five".