253660997 has 8 divisors (see below), whose sum is σ = 269030400. Its totient is φ = 238653360.

The previous prime is 253660987. The next prime is 253661017. The reversal of 253660997 is 799066352.

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 253660997 - 2²⁰ = 252612421 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 (253660907) 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, 88997 + ... + 91802.

It is an arithmetic number, because the mean of its divisors is an integer number (33628800).

Almost surely, 2^253660997 is an apocalyptic number.

It is an amenable number.

253660997 is a deficient number, since it is larger than the sum of its proper divisors (15369403).

253660997 is a wasteful number, since it uses less digits than its factorization.

253660997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180883.

The product of its (nonzero) digits is 612360, while the sum is 47.

The square root of 253660997 is about 15926.7384294462. The cubic root of 253660997 is about 633.0206803679.

The spelling of 253660997 in words is "two hundred fifty-three million, six hundred sixty thousand, nine hundred ninety-seven".