1668992256 has 72 divisors (see below), whose sum is σ = 4935524160. Its totient is φ = 556328448.

The previous prime is 1668992251. The next prime is 1668992261. The reversal of 1668992256 is 6522998661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1668992251) and next prime (1668992261).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668992251) 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, 113820 + ... + 127643.

Almost surely, 2^1668992256 is an apocalyptic number.

1668992256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1668992256 is an abundant number, since it is smaller than the sum of its proper divisors (3266531904).

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

1668992256 is an equidigital number, since it uses as much as digits as its factorization.

1668992256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241488 (or 241468 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 1668992256 is about 40853.3016535996. The cubic root of 1668992256 is about 1186.1823034109.

The spelling of 1668992256 in words is "one billion, six hundred sixty-eight million, nine hundred ninety-two thousand, two hundred fifty-six".