2645621015 has 4 divisors (see below), whose sum is σ = 3174745224. Its totient is φ = 2116496808.

The previous prime is 2645620997. The next prime is 2645621021. The reversal of 2645621015 is 5101265462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5101265462 = 2 ⋅2550632731.

It is a cyclic number.

It is not a de Polignac number, because 2645621015 - 2⁶ = 2645620951 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 3 ways as a sum of consecutive naturals, for example, 264562097 + ... + 264562106.

It is an arithmetic number, because the mean of its divisors is an integer number (793686306).

Almost surely, 2^2645621015 is an apocalyptic number.

2645621015 is a deficient number, since it is larger than the sum of its proper divisors (529124209).

2645621015 is an equidigital number, since it uses as much as digits as its factorization.

2645621015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529124208.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 2645621015 is about 51435.6006575212. The cubic root of 2645621015 is about 1383.0648494609.

Adding to 2645621015 its reverse (5101265462), we get a palindrome (7746886477).

The spelling of 2645621015 in words is "two billion, six hundred forty-five million, six hundred twenty-one thousand, fifteen".