25215004445 has 4 divisors (see below), whose sum is σ = 30258005340. Its totient is φ = 20172003552.

The previous prime is 25215004427. The next prime is 25215004457. The reversal of 25215004445 is 54440051252.

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 8503237369 + 16711767076 = 92213^2 + 129274^2 .

It is a cyclic number.

It is not a de Polignac number, because 25215004445 - 2¹⁰ = 25215003421 is a prime.

It is a super-2 number, since 2×25215004445² (a number of 22 digits) contains 22 as substring.

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, 2521500440 + ... + 2521500449.

It is an arithmetic number, because the mean of its divisors is an integer number (7564501335).

Almost surely, 2^25215004445 is an apocalyptic number.

It is an amenable number.

25215004445 is a deficient number, since it is larger than the sum of its proper divisors (5043000895).

25215004445 is an equidigital number, since it uses as much as digits as its factorization.

25215004445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043000894.

The product of its (nonzero) digits is 32000, while the sum is 32.

Adding to 25215004445 its reverse (54440051252), we get a palindrome (79655055697).

The spelling of 25215004445 in words is "twenty-five billion, two hundred fifteen million, four thousand, four hundred forty-five".