74255732561 has 2 divisors, whose sum is σ = 74255732562. Its totient is φ = 74255732560.

The previous prime is 74255732459. The next prime is 74255732609. The reversal of 74255732561 is 16523755247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60772110400 + 13483622161 = 246520^2 + 116119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74255732561 is a prime.

It is not a weakly prime, because it can be changed into another prime (74255732861) 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, 37127866280 + 37127866281.

It is an arithmetic number, because the mean of its divisors is an integer number (37127866281).

Almost surely, 2^74255732561 is an apocalyptic number.

It is an amenable number.

74255732561 is a deficient number, since it is larger than the sum of its proper divisors (1).

74255732561 is an equidigital number, since it uses as much as digits as its factorization.

74255732561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764000, while the sum is 47.

The spelling of 74255732561 in words is "seventy-four billion, two hundred fifty-five million, seven hundred thirty-two thousand, five hundred sixty-one".