3961658205 has 12 divisors (see below), whose sum is σ = 6866874300. Its totient is φ = 2112884352.

The previous prime is 3961658131. The next prime is 3961658269. The reversal of 3961658205 is 5028561693.

3961658205 is a `hidden beast` number, since 3 + 9 + 61 + 6 + 582 + 0 + 5 = 666.

3961658205 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2816106489 + 1145551716 = 53067^2 + 33846^2 .

It is not a de Polignac number, because 3961658205 - 2⁸ = 3961657949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 88036849 = 3961658205 / (3 + 9 + 6 + 1 + 6 + 5 + 8 + 2 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44018380 + ... + 44018469.

It is an arithmetic number, because the mean of its divisors is an integer number (572239525).

Almost surely, 2^3961658205 is an apocalyptic number.

It is an amenable number.

3961658205 is a deficient number, since it is larger than the sum of its proper divisors (2905216095).

3961658205 is a wasteful number, since it uses less digits than its factorization.

3961658205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88036860 (or 88036857 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 3961658205 is about 62941.7048148523. The cubic root of 3961658205 is about 1582.3127755564.

The spelling of 3961658205 in words is "three billion, nine hundred sixty-one million, six hundred fifty-eight thousand, two hundred five".