3901666545 has 48 divisors (see below), whose sum is σ = 7739776512. Its totient is φ = 1781136000.

The previous prime is 3901666537. The next prime is 3901666547. The reversal of 3901666545 is 5456661093.

It is not a de Polignac number, because 3901666545 - 2³ = 3901666537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3901666545.

It is not an unprimeable number, because it can be changed into a prime (3901666547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228319 + ... + 244811.

It is an arithmetic number, because the mean of its divisors is an integer number (161245344).

Almost surely, 2^3901666545 is an apocalyptic number.

3901666545 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3901666545 is a deficient number, since it is larger than the sum of its proper divisors (3838109967).

3901666545 is a wasteful number, since it uses less digits than its factorization.

3901666545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17262 (or 17259 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The square root of 3901666545 is about 62463.3215975584. The cubic root of 3901666545 is about 1574.2850935361.

The spelling of 3901666545 in words is "three billion, nine hundred one million, six hundred sixty-six thousand, five hundred forty-five".