1668726794 has 32 divisors (see below), whose sum is σ = 3014647680. Its totient is φ = 676760832.

The previous prime is 1668726769. The next prime is 1668726799. The reversal of 1668726794 is 4976278661.

It is a super-2 number, since 2×1668726794² = 5569298226027036872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1668726799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271742 + ... + 277814.

It is an arithmetic number, because the mean of its divisors is an integer number (94207740).

Almost surely, 2^1668726794 is an apocalyptic number.

1668726794 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1668726794 is a deficient number, since it is larger than the sum of its proper divisors (1345920886).

1668726794 is a wasteful number, since it uses less digits than its factorization.

1668726794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7134.

The product of its digits is 6096384, while the sum is 56.

The square root of 1668726794 is about 40850.0525581057. The cubic root of 1668726794 is about 1186.1194105640.

The spelling of 1668726794 in words is "one billion, six hundred sixty-eight million, seven hundred twenty-six thousand, seven hundred ninety-four".