68919561 has 12 divisors (see below), whose sum is σ = 99655920. Its totient is φ = 45897720.

The previous prime is 68919559. The next prime is 68919577. The reversal of 68919561 is 16591986.

68919561 is a `hidden beast` number, since 6 + 89 + 1 + 9 + 561 = 666.

It is not a de Polignac number, because 68919561 - 2¹ = 68919559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68919511) 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, 6310 + ... + 13328.

It is an arithmetic number, because the mean of its divisors is an integer number (8304660).

Almost surely, 2^68919561 is an apocalyptic number.

It is an amenable number.

68919561 is a deficient number, since it is larger than the sum of its proper divisors (30736359).

68919561 is a wasteful number, since it uses less digits than its factorization.

68919561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8116 (or 8113 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 68919561 is about 8301.7805921381. The cubic root of 68919561 is about 409.9971465199.

The spelling of 68919561 in words is "sixty-eight million, nine hundred nineteen thousand, five hundred sixty-one".