3666686668535 has 8 divisors (see below), whose sum is σ = 4800026184336. Its totient is φ = 2666681213440.

The previous prime is 3666686668481. The next prime is 3666686668577. The reversal of 3666686668535 is 5358666866663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3666686668535 - 2⁸ = 3666686668279 is a prime.

It is a super-2 number, since 2×3666686668535² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33333515114 + ... + 33333515223.

It is an arithmetic number, because the mean of its divisors is an integer number (600003273042).

Almost surely, 2^{3666686668535} is an apocalyptic number.

3666686668535 is a deficient number, since it is larger than the sum of its proper divisors (1133339515801).

3666686668535 is a wasteful number, since it uses less digits than its factorization.

3666686668535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66667030353.

The product of its digits is 4031078400, while the sum is 74.

The spelling of 3666686668535 in words is "three trillion, six hundred sixty-six billion, six hundred eighty-six million, six hundred sixty-eight thousand, five hundred thirty-five".