1668747311 has 16 divisors (see below), whose sum is σ = 2128904448. Its totient is φ = 1270080000.

The previous prime is 1668747307. The next prime is 1668747337. The reversal of 1668747311 is 1137478661.

It is a happy number.

It is not a de Polignac number, because 1668747311 - 2² = 1668747307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668747341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248690 + ... + 255311.

It is an arithmetic number, because the mean of its divisors is an integer number (133056528).

Almost surely, 2^1668747311 is an apocalyptic number.

1668747311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1668747311 is a deficient number, since it is larger than the sum of its proper divisors (460157137).

1668747311 is a wasteful number, since it uses less digits than its factorization.

1668747311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504062.

The product of its digits is 169344, while the sum is 44.

The square root of 1668747311 is about 40850.3036830817. The cubic root of 1668747311 is about 1186.1242716578.

The spelling of 1668747311 in words is "one billion, six hundred sixty-eight million, seven hundred forty-seven thousand, three hundred eleven".