71655553 has 2 divisors, whose sum is σ = 71655554. Its totient is φ = 71655552.

The previous prime is 71655509. The next prime is 71655581. The reversal of 71655553 is 35555617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 5607424 = 8127^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 71655553 - 2⁹ = 71655041 is a prime.

It is not a weakly prime, because it can be changed into another prime (71655503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35827776 + 35827777.

It is an arithmetic number, because the mean of its divisors is an integer number (35827777).

Almost surely, 2^71655553 is an apocalyptic number.

It is an amenable number.

71655553 is a deficient number, since it is larger than the sum of its proper divisors (1).

71655553 is an equidigital number, since it uses as much as digits as its factorization.

71655553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78750, while the sum is 37.

The square root of 71655553 is about 8464.9603070540. The cubic root of 71655553 is about 415.3522977398.

The spelling of 71655553 in words is "seventy-one million, six hundred fifty-five thousand, five hundred fifty-three".