25661155 has 8 divisors (see below), whose sum is σ = 33162192. Its totient is φ = 18949728.

The previous prime is 25661147. The next prime is 25661189. The reversal of 25661155 is 55116652.

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

It is a cyclic number.

It is not a de Polignac number, because 25661155 - 2³ = 25661147 is a prime.

It is a Duffinian 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, 197329 + ... + 197458.

It is an arithmetic number, because the mean of its divisors is an integer number (4145274).

Almost surely, 2^25661155 is an apocalyptic number.

25661155 is a deficient number, since it is larger than the sum of its proper divisors (7501037).

25661155 is a wasteful number, since it uses less digits than its factorization.

25661155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394805.

The product of its digits is 9000, while the sum is 31.

The square root of 25661155 is about 5065.6840604207. The cubic root of 25661155 is about 294.9570175814.

It can be divided in two parts, 2566 and 1155, that added together give a square (3721 = 61²).

The spelling of 25661155 in words is "twenty-five million, six hundred sixty-one thousand, one hundred fifty-five".