25155553 has 2 divisors, whose sum is σ = 25155554. Its totient is φ = 25155552.

The previous prime is 25155547. The next prime is 25155569. The reversal of 25155553 is 35555152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24088464 + 1067089 = 4908^2 + 1033^2 .

It is a cyclic number.

It is not a de Polignac number, because 25155553 - 2¹⁷ = 25024481 is a prime.

It is not a weakly prime, because it can be changed into another prime (25155853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12577776 + 12577777.

It is an arithmetic number, because the mean of its divisors is an integer number (12577777).

Almost surely, 2^25155553 is an apocalyptic number.

It is an amenable number.

25155553 is a deficient number, since it is larger than the sum of its proper divisors (1).

25155553 is an equidigital number, since it uses as much as digits as its factorization.

25155553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18750, while the sum is 31.

The square root of 25155553 is about 5015.5311782502. The cubic root of 25155553 is about 293.0069733185.

The spelling of 25155553 in words is "twenty-five million, one hundred fifty-five thousand, five hundred fifty-three".