1668353697 has 6 divisors (see below), whose sum is σ = 2409844242. Its totient is φ = 1112235792.

The previous prime is 1668353681. The next prime is 1668353707. The reversal of 1668353697 is 7963538661.

1668353697 is a `hidden beast` number, since 16 + 6 + 8 + 3 + 536 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1158993936 + 509359761 = 34044^2 + 22569^2 .

It is not a de Polignac number, because 1668353697 - 2⁴ = 1668353681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668353627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92686308 + ... + 92686325.

It is an arithmetic number, because the mean of its divisors is an integer number (401640707).

Almost surely, 2^1668353697 is an apocalyptic number.

It is an amenable number.

1668353697 is a deficient number, since it is larger than the sum of its proper divisors (741490545).

1668353697 is a wasteful number, since it uses less digits than its factorization.

1668353697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185372639 (or 185372636 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 1668353697 is about 40845.4856379502. The cubic root of 1668353697 is about 1186.0310057234.

The spelling of 1668353697 in words is "one billion, six hundred sixty-eight million, three hundred fifty-three thousand, six hundred ninety-seven".