2541565645 has 8 divisors (see below), whose sum is σ = 3055735800. Its totient is φ = 2029347840.

The previous prime is 2541565589. The next prime is 2541565661. The reversal of 2541565645 is 5465651452.

It can be written as a sum of positive squares in 4 ways, for example, as 81108036 + 2460457609 = 9006^2 + 49603^2 .

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

It is not a de Polignac number, because 2541565645 - 2¹⁷ = 2541434573 is a prime.

It is a super-3 number, since 3×2541565645³ (a number of 29 digits) contains 333 as substring.

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, 485220 + ... + 490429.

It is an arithmetic number, because the mean of its divisors is an integer number (381966975).

Almost surely, 2^2541565645 is an apocalyptic number.

It is an amenable number.

2541565645 is a deficient number, since it is larger than the sum of its proper divisors (514170155).

2541565645 is an equidigital number, since it uses as much as digits as its factorization.

2541565645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976175.

The product of its digits is 720000, while the sum is 43.

The square root of 2541565645 is about 50413.9429622401. The cubic root of 2541565645 is about 1364.6892707799.

The spelling of 2541565645 in words is "two billion, five hundred forty-one million, five hundred sixty-five thousand, six hundred forty-five".