25551605 has 8 divisors (see below), whose sum is σ = 30689664. Its totient is φ = 20422800.

The previous prime is 25551587. The next prime is 25551607. The reversal of 25551605 is 50615552.

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

It is not a de Polignac number, because 25551605 - 2⁶ = 25551541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25551607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7760 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (3836208).

Almost surely, 2^25551605 is an apocalyptic number.

It is an amenable number.

25551605 is a deficient number, since it is larger than the sum of its proper divisors (5138059).

25551605 is a wasteful number, since it uses less digits than its factorization.

25551605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4627.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 25551605 is about 5054.8595430536. The cubic root of 25551605 is about 294.5366853392.

The spelling of 25551605 in words is "twenty-five million, five hundred fifty-one thousand, six hundred five".