3915456561 has 12 divisors (see below), whose sum is σ = 5687257680. Its totient is φ = 2595720600.

The previous prime is 3915456557. The next prime is 3915456607. The reversal of 3915456561 is 1656545193.

3915456561 is a `hidden beast` number, since 39 + 1 + 5 + 4 + 56 + 561 = 666.

It is not a de Polignac number, because 3915456561 - 2² = 3915456557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3915456161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1213615 + ... + 1216836.

It is an arithmetic number, because the mean of its divisors is an integer number (473938140).

Almost surely, 2^3915456561 is an apocalyptic number.

It is an amenable number.

3915456561 is a deficient number, since it is larger than the sum of its proper divisors (1771801119).

3915456561 is a wasteful number, since it uses less digits than its factorization.

3915456561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2430636 (or 2430633 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The square root of 3915456561 is about 62573.6091415542. The cubic root of 3915456561 is about 1576.1376258628.

The spelling of 3915456561 in words is "three billion, nine hundred fifteen million, four hundred fifty-six thousand, five hundred sixty-one".