253305717617 has 4 divisors (see below), whose sum is σ = 254441617920. Its totient is φ = 252169817316.

The previous prime is 253305717607. The next prime is 253305717619. The reversal of 253305717617 is 716717503352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253305717617 - 2¹⁰ = 253305716593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253305717619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 567949817 + ... + 567950262.

It is an arithmetic number, because the mean of its divisors is an integer number (63610404480).

Almost surely, 2^253305717617 is an apocalyptic number.

It is an amenable number.

253305717617 is a deficient number, since it is larger than the sum of its proper divisors (1135900303).

253305717617 is a wasteful number, since it uses less digits than its factorization.

253305717617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135900302.

The product of its (nonzero) digits is 926100, while the sum is 47.

The spelling of 253305717617 in words is "two hundred fifty-three billion, three hundred five million, seven hundred seventeen thousand, six hundred seventeen".