3897945401666 has 8 divisors (see below), whose sum is σ = 5982892942224. Its totient is φ = 1903647754260.

The previous prime is 3897945401617. The next prime is 3897945401683. The reversal of 3897945401666 is 6661045497983.

3897945401666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×3897945401666² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3897945401596 and 3897945401605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22662473180 + ... + 22662473351.

It is an arithmetic number, because the mean of its divisors is an integer number (747861617778).

Almost surely, 2^{3897945401666} is an apocalyptic number.

3897945401666 is a deficient number, since it is larger than the sum of its proper divisors (2084947540558).

3897945401666 is a wasteful number, since it uses less digits than its factorization.

3897945401666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45324946576.

The product of its (nonzero) digits is 235146240, while the sum is 68.

The spelling of 3897945401666 in words is "three trillion, eight hundred ninety-seven billion, nine hundred forty-five million, four hundred one thousand, six hundred sixty-six".