646488811 has 4 divisors (see below), whose sum is σ = 646582000. Its totient is φ = 646395624.

The previous prime is 646488809. The next prime is 646488823. The reversal of 646488811 is 118884646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646488811 - 2¹ = 646488809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646488211) 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, 35271 + ... + 50368.

It is an arithmetic number, because the mean of its divisors is an integer number (161645500).

Almost surely, 2^646488811 is an apocalyptic number.

646488811 is a deficient number, since it is larger than the sum of its proper divisors (93189).

646488811 is an equidigital number, since it uses as much as digits as its factorization.

646488811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93188.

The product of its digits is 294912, while the sum is 46.

The square root of 646488811 is about 25426.1442417052. The cubic root of 646488811 is about 864.6765297922.

The spelling of 646488811 in words is "six hundred forty-six million, four hundred eighty-eight thousand, eight hundred eleven".