25061615 has 4 divisors (see below), whose sum is σ = 30073944. Its totient is φ = 20049288.

The previous prime is 25061593. The next prime is 25061639. The reversal of 25061615 is 51616052.

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

It is a cyclic number.

It is not a de Polignac number, because 25061615 - 2¹⁸ = 24799471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2506157 + ... + 2506166.

It is an arithmetic number, because the mean of its divisors is an integer number (7518486).

Almost surely, 2^25061615 is an apocalyptic number.

25061615 is a deficient number, since it is larger than the sum of its proper divisors (5012329).

25061615 is an equidigital number, since it uses as much as digits as its factorization.

25061615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012328.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25061615 is about 5006.1577082629. The cubic root of 25061615 is about 292.6417945480.

Adding to 25061615 its reverse (51616052), we get a palindrome (76677667).

The spelling of 25061615 in words is "twenty-five million, sixty-one thousand, six hundred fifteen".