1668416751 has 8 divisors (see below), whose sum is σ = 2471728560. Its totient is φ = 1112277816.

The previous prime is 1668416749. The next prime is 1668416753. The reversal of 1668416751 is 1576148661.

1668416751 is a `hidden beast` number, since 166 + 8 + 416 + 75 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1668416749) and next prime (1668416753).

It is not a de Polignac number, because 1668416751 - 2¹ = 1668416749 is a prime.

It is a super-2 number, since 2×1668416751² = 5567228910034792002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1668416697 and 1668416706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668416753) 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, 30896580 + ... + 30896633.

It is an arithmetic number, because the mean of its divisors is an integer number (308966070).

Almost surely, 2^1668416751 is an apocalyptic number.

1668416751 is a deficient number, since it is larger than the sum of its proper divisors (803311809).

1668416751 is an equidigital number, since it uses as much as digits as its factorization.

1668416751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61793222 (or 61793216 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1668416751 is about 40846.2574907420. The cubic root of 1668416751 is about 1186.0459472107.

The spelling of 1668416751 in words is "one billion, six hundred sixty-eight million, four hundred sixteen thousand, seven hundred fifty-one".