253552661 has 6 divisors (see below), whose sum is σ = 257781186. Its totient is φ = 249392400.

The previous prime is 253552643. The next prime is 253552687. The reversal of 253552661 is 166255352.

253552661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 74822500 + 178730161 = 8650^2 + 13369^2 .

It is not a de Polignac number, because 253552661 - 2¹⁴ = 253536277 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 (253552631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30350 + ... + 37791.

It is an arithmetic number, because the mean of its divisors is an integer number (42963531).

Almost surely, 2^253552661 is an apocalyptic number.

It is an amenable number.

253552661 is a deficient number, since it is larger than the sum of its proper divisors (4228525).

253552661 is an frugal number, since it uses more digits than its factorization.

253552661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68263 (or 68202 counting only the distinct ones).

The product of its digits is 54000, while the sum is 35.

The square root of 253552661 is about 15923.3369932310. The cubic root of 253552661 is about 632.9305486637.

The spelling of 253552661 in words is "two hundred fifty-three million, five hundred fifty-two thousand, six hundred sixty-one".