653728257673 has 4 divisors (see below), whose sum is σ = 653732794368. Its totient is φ = 653723720980.

The previous prime is 653728257661. The next prime is 653728257713. The reversal of 653728257673 is 376752827356.

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 a de Polignac number, because none of the positive numbers 2^k-653728257673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653728257473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2044861 + ... + 2342842.

It is an arithmetic number, because the mean of its divisors is an integer number (163433198592).

Almost surely, 2^653728257673 is an apocalyptic number.

It is an amenable number.

653728257673 is a deficient number, since it is larger than the sum of its proper divisors (4536695).

653728257673 is a wasteful number, since it uses less digits than its factorization.

653728257673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536694.

The product of its digits is 88905600, while the sum is 61.

The spelling of 653728257673 in words is "six hundred fifty-three billion, seven hundred twenty-eight million, two hundred fifty-seven thousand, six hundred seventy-three".