1668538517354 has 32 divisors (see below), whose sum is σ = 2584822648320. Its totient is φ = 807380675712.

The previous prime is 1668538517351. The next prime is 1668538517363. The reversal of 1668538517354 is 4537158358661.

It is a super-2 number, since 2×1668538517354² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1668538517351) 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, 8553899 + ... + 8746785.

It is an arithmetic number, because the mean of its divisors is an integer number (80775707760).

Almost surely, 2^{1668538517354} is an apocalyptic number.

1668538517354 is a deficient number, since it is larger than the sum of its proper divisors (916284130966).

1668538517354 is a wasteful number, since it uses less digits than its factorization.

1668538517354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194054.

The product of its digits is 72576000, while the sum is 62.

The spelling of 1668538517354 in words is "one trillion, six hundred sixty-eight billion, five hundred thirty-eight million, five hundred seventeen thousand, three hundred fifty-four".