2155510465 has 4 divisors (see below), whose sum is σ = 2586612564. Its totient is φ = 1724408368.

The previous prime is 2155510459. The next prime is 2155510519. The reversal of 2155510465 is 5640155512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 907937424 + 1247573041 = 30132^2 + 35321^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155510465 - 2⁵ = 2155510433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2155510465.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215551042 + ... + 215551051.

It is an arithmetic number, because the mean of its divisors is an integer number (646653141).

Almost surely, 2^2155510465 is an apocalyptic number.

It is an amenable number.

2155510465 is a deficient number, since it is larger than the sum of its proper divisors (431102099).

2155510465 is an equidigital number, since it uses as much as digits as its factorization.

2155510465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431102098.

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 2155510465 is about 46427.4753244240. The cubic root of 2155510465 is about 1291.7645992945.

Adding to 2155510465 its reverse (5640155512), we get a palindrome (7795665977).

The spelling of 2155510465 in words is "two billion, one hundred fifty-five million, five hundred ten thousand, four hundred sixty-five".