253402661 has 8 divisors (see below), whose sum is σ = 266198400. Its totient is φ = 240755152.

The previous prime is 253402619. The next prime is 253402693. The reversal of 253402661 is 166204352.

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 253402661 - 2¹⁴ = 253386277 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 (253402861) 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, 33545 + ... + 40398.

It is an arithmetic number, because the mean of its divisors is an integer number (33274800).

Almost surely, 2^253402661 is an apocalyptic number.

It is an amenable number.

253402661 is a deficient number, since it is larger than the sum of its proper divisors (12795739).

253402661 is a wasteful number, since it uses less digits than its factorization.

253402661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74115.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 253402661 is about 15918.6262284156. The cubic root of 253402661 is about 632.8057115984.

The spelling of 253402661 in words is "two hundred fifty-three million, four hundred two thousand, six hundred sixty-one".