74816557 has 2 divisors, whose sum is σ = 74816558. Its totient is φ = 74816556.

The previous prime is 74816551. The next prime is 74816569. The reversal of 74816557 is 75561847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58583716 + 16232841 = 7654^2 + 4029^2 .

It is an emirp because it is prime and its reverse (75561847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74816557 - 2¹⁵ = 74783789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74816551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37408278 + 37408279.

It is an arithmetic number, because the mean of its divisors is an integer number (37408279).

Almost surely, 2^74816557 is an apocalyptic number.

It is an amenable number.

74816557 is a deficient number, since it is larger than the sum of its proper divisors (1).

74816557 is an equidigital number, since it uses as much as digits as its factorization.

74816557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 235200, while the sum is 43.

The square root of 74816557 is about 8649.6564671668. The cubic root of 74816557 is about 421.3722256839.

The spelling of 74816557 in words is "seventy-four million, eight hundred sixteen thousand, five hundred fifty-seven".