641660273 has 4 divisors (see below), whose sum is σ = 651237360. Its totient is φ = 632083188.

The previous prime is 641660263. The next prime is 641660297. The reversal of 641660273 is 372066146.

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, and also an emirpimes, since its reverse is a distinct semiprime: 372066146 = 2 ⋅186033073.

It is a cyclic number.

It is not a de Polignac number, because 641660273 - 2⁸ = 641660017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641660213) 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, 4788443 + ... + 4788576.

It is an arithmetic number, because the mean of its divisors is an integer number (162809340).

Almost surely, 2^641660273 is an apocalyptic number.

It is an amenable number.

641660273 is a deficient number, since it is larger than the sum of its proper divisors (9577087).

641660273 is an equidigital number, since it uses as much as digits as its factorization.

641660273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9577086.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 641660273 is about 25331.0140539221. The cubic root of 641660273 is about 862.5184304120.

The spelling of 641660273 in words is "six hundred forty-one million, six hundred sixty thousand, two hundred seventy-three".