666490848 has 48 divisors (see below), whose sum is σ = 1852457040. Its totient is φ = 209094656.

The previous prime is 666490843. The next prime is 666490861. The reversal of 666490848 is 848094666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 666490848.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666490843) 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, 202563 + ... + 205826.

It is an arithmetic number, because the mean of its divisors is an integer number (38592855).

Almost surely, 2^666490848 is an apocalyptic number.

666490848 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

666490848 is an abundant number, since it is smaller than the sum of its proper divisors (1185966192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666490848 is a wasteful number, since it uses less digits than its factorization.

666490848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408419 (or 408411 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The square root of 666490848 is about 25816.4840363672. The cubic root of 666490848 is about 873.5036621080.

The spelling of 666490848 in words is "six hundred sixty-six million, four hundred ninety thousand, eight hundred forty-eight".