3973166543601 has 6 divisors (see below), whose sum is σ = 5739018340770. Its totient is φ = 2648777695728.

The previous prime is 3973166543581. The next prime is 3973166543611. The reversal of 3973166543601 is 1063456613793.

3973166543601 is a `hidden beast` number, since 3 + 9 + 7 + 31 + 6 + 6 + 543 + 60 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3526038950625 + 447127592976 = 1877775^2 + 668676^2 .

It is not a de Polignac number, because 3973166543601 - 2⁹ = 3973166543089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3973166543611) 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, 220731474636 + ... + 220731474653.

It is an arithmetic number, because the mean of its divisors is an integer number (956503056795).

Almost surely, 2^{3973166543601} is an apocalyptic number.

It is an amenable number.

3973166543601 is a deficient number, since it is larger than the sum of its proper divisors (1765851797169).

3973166543601 is a wasteful number, since it uses less digits than its factorization.

3973166543601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441462949295 (or 441462949292 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 54.

The spelling of 3973166543601 in words is "three trillion, nine hundred seventy-three billion, one hundred sixty-six million, five hundred forty-three thousand, six hundred one".