3954001857161 has 4 divisors (see below), whose sum is σ = 3956554474500. Its totient is φ = 3951449239824.

The previous prime is 3954001857133. The next prime is 3954001857227. The reversal of 3954001857161 is 1617581004593.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1091933041936 + 2862068815225 = 1044956^2 + 1691765^2 .

It is a cyclic number.

It is not a de Polignac number, because 3954001857161 - 2³⁴ = 3936821987977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3954001857131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276306346 + ... + 1276309443.

It is an arithmetic number, because the mean of its divisors is an integer number (989138618625).

Almost surely, 2^{3954001857161} is an apocalyptic number.

It is an amenable number.

3954001857161 is a deficient number, since it is larger than the sum of its proper divisors (2552617339).

3954001857161 is a wasteful number, since it uses less digits than its factorization.

3954001857161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552617338.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 3954001857161 in words is "three trillion, nine hundred fifty-four billion, one million, eight hundred fifty-seven thousand, one hundred sixty-one".