74186432989 has 2 divisors, whose sum is σ = 74186432990. Its totient is φ = 74186432988.

The previous prime is 74186432987. The next prime is 74186433023. The reversal of 74186432989 is 98923468147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68090727364 + 6095705625 = 260942^2 + 78075^2 .

It is a cyclic number.

It is not a de Polignac number, because 74186432989 - 2¹ = 74186432987 is a prime.

It is a super-3 number, since 3×74186432989³ (a number of 34 digits) contains 333 as substring.

Together with 74186432987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74186432987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37093216494 + 37093216495.

It is an arithmetic number, because the mean of its divisors is an integer number (37093216495).

Almost surely, 2^74186432989 is an apocalyptic number.

It is an amenable number.

74186432989 is a deficient number, since it is larger than the sum of its proper divisors (1).

74186432989 is an equidigital number, since it uses as much as digits as its factorization.

74186432989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 61.

The spelling of 74186432989 in words is "seventy-four billion, one hundred eighty-six million, four hundred thirty-two thousand, nine hundred eighty-nine".