3949905599901 has 24 divisors (see below), whose sum is σ = 5747153326200. Its totient is φ = 2614068043776.

The previous prime is 3949905599891. The next prime is 3949905599951. The reversal of 3949905599901 is 1099955099493.

It can be written as a sum of positive squares in 4 ways, for example, as 611516180025 + 3338389419876 = 781995^2 + 1827126^2 .

It is not a de Polignac number, because 3949905599901 - 2³⁰ = 3948831858077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3949905599901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3949905599951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1684780 + ... + 3276933.

It is an arithmetic number, because the mean of its divisors is an integer number (239464721925).

Almost surely, 2^{3949905599901} is an apocalyptic number.

It is an amenable number.

3949905599901 is a deficient number, since it is larger than the sum of its proper divisors (1797247726299).

3949905599901 is a wasteful number, since it uses less digits than its factorization.

3949905599901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4962365 (or 4962362 counting only the distinct ones).

The product of its (nonzero) digits is 159432300, while the sum is 72.

The spelling of 3949905599901 in words is "three trillion, nine hundred forty-nine billion, nine hundred five million, five hundred ninety-nine thousand, nine hundred one".