3945649843501 has 8 divisors (see below), whose sum is σ = 4001822730360. Its totient is φ = 3889740062208.

The previous prime is 3945649843481. The next prime is 3945649843519. The reversal of 3945649843501 is 1053489465493.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9100206025 + 3936549637476 = 95395^2 + 1984074^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3945649843501 - 2¹¹ = 3945649841453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3945649843501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945649843571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65746186 + ... + 65806171.

It is an arithmetic number, because the mean of its divisors is an integer number (500227841295).

Almost surely, 2^{3945649843501} is an apocalyptic number.

It is an amenable number.

3945649843501 is a deficient number, since it is larger than the sum of its proper divisors (56172886859).

3945649843501 is a wasteful number, since it uses less digits than its factorization.

3945649843501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131552783.

The product of its (nonzero) digits is 55987200, while the sum is 61.

The spelling of 3945649843501 in words is "three trillion, nine hundred forty-five billion, six hundred forty-nine million, eight hundred forty-three thousand, five hundred one".