74434667561 has 2 divisors, whose sum is σ = 74434667562. Its totient is φ = 74434667560.

The previous prime is 74434667543. The next prime is 74434667597. The reversal of 74434667561 is 16576643447.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56106923161 + 18327744400 = 236869^2 + 135380^2 .

It is a cyclic number.

It is not a de Polignac number, because 74434667561 - 2²⁶ = 74367558697 is a prime.

It is not a weakly prime, because it can be changed into another prime (74434667761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37217333780 + 37217333781.

It is an arithmetic number, because the mean of its divisors is an integer number (37217333781).

Almost surely, 2^74434667561 is an apocalyptic number.

It is an amenable number.

74434667561 is a deficient number, since it is larger than the sum of its proper divisors (1).

74434667561 is an equidigital number, since it uses as much as digits as its factorization.

74434667561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 53.

The spelling of 74434667561 in words is "seventy-four billion, four hundred thirty-four million, six hundred sixty-seven thousand, five hundred sixty-one".