1664270656 has 28 divisors (see below), whose sum is σ = 3391799668. Its totient is φ = 809644032.

The previous prime is 1664270653. The next prime is 1664270689. The reversal of 1664270656 is 6560724661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1127885056 + 536385600 = 33584^2 + 23160^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664270653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349041 + ... + 353776.

Almost surely, 2^1664270656 is an apocalyptic number.

1664270656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1664270656 is an abundant number, since it is smaller than the sum of its proper divisors (1727529012).

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

1664270656 is an equidigital number, since it uses as much as digits as its factorization.

1664270656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702866 (or 702856 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 1664270656 is about 40795.4734743942. The cubic root of 1664270656 is about 1185.0626720638.

The spelling of 1664270656 in words is "one billion, six hundred sixty-four million, two hundred seventy thousand, six hundred fifty-six".