3901666505 has 16 divisors (see below), whose sum is σ = 5129956800. Its totient is φ = 2825175360.

The previous prime is 3901666487. The next prime is 3901666537. The reversal of 3901666505 is 5056661093.

3901666505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-3901666505 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142295 + ... + 167484.

It is an arithmetic number, because the mean of its divisors is an integer number (320622300).

Almost surely, 2^3901666505 is an apocalyptic number.

It is an amenable number.

3901666505 is a deficient number, since it is larger than the sum of its proper divisors (1228290295).

3901666505 is a wasteful number, since it uses less digits than its factorization.

3901666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310024.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 3901666505 is about 62463.3212773705. The cubic root of 3901666505 is about 1574.2850881563.

The spelling of 3901666505 in words is "three billion, nine hundred one million, six hundred sixty-six thousand, five hundred five".