74745553 has 2 divisors, whose sum is σ = 74745554. Its totient is φ = 74745552.

The previous prime is 74745533. The next prime is 74745611. The reversal of 74745553 is 35554747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68359824 + 6385729 = 8268^2 + 2527^2 .

It is an emirp because it is prime and its reverse (35554747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74745553 - 2⁵ = 74745521 is a prime.

It is not a weakly prime, because it can be changed into another prime (74745523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37372776 + 37372777.

It is an arithmetic number, because the mean of its divisors is an integer number (37372777).

Almost surely, 2^74745553 is an apocalyptic number.

It is an amenable number.

74745553 is a deficient number, since it is larger than the sum of its proper divisors (1).

74745553 is an equidigital number, since it uses as much as digits as its factorization.

74745553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000, while the sum is 40.

The square root of 74745553 is about 8645.5510524200. The cubic root of 74745553 is about 421.2388836157.

The spelling of 74745553 in words is "seventy-four million, seven hundred forty-five thousand, five hundred fifty-three".