74618561 has 2 divisors, whose sum is σ = 74618562. Its totient is φ = 74618560.

The previous prime is 74618549. The next prime is 74618569. The reversal of 74618561 is 16581647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 16248961 = 7640^2 + 4031^2 .

It is a cyclic number.

It is not a de Polignac number, because 74618561 - 2¹⁰ = 74617537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74618569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37309280 + 37309281.

It is an arithmetic number, because the mean of its divisors is an integer number (37309281).

Almost surely, 2^74618561 is an apocalyptic number.

It is an amenable number.

74618561 is a deficient number, since it is larger than the sum of its proper divisors (1).

74618561 is an equidigital number, since it uses as much as digits as its factorization.

74618561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 74618561 is about 8638.2035748181. The cubic root of 74618561 is about 421.0001880678. Note that the first 3 decimals are identical.

The spelling of 74618561 in words is "seventy-four million, six hundred eighteen thousand, five hundred sixty-one".