655011601 has 2 divisors, whose sum is σ = 655011602. Its totient is φ = 655011600.

The previous prime is 655011589. The next prime is 655011667. The reversal of 655011601 is 106110556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345216400 + 309795201 = 18580^2 + 17601^2 .

It is a cyclic number.

It is not a de Polignac number, because 655011601 - 2¹⁷ = 654880529 is a prime.

It is not a weakly prime, because it can be changed into another prime (655011671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327505800 + 327505801.

It is an arithmetic number, because the mean of its divisors is an integer number (327505801).

Almost surely, 2^655011601 is an apocalyptic number.

It is an amenable number.

655011601 is a deficient number, since it is larger than the sum of its proper divisors (1).

655011601 is an equidigital number, since it uses as much as digits as its factorization.

655011601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 655011601 is about 25593.1944274254. The cubic root of 655011601 is about 868.4596874381.

The spelling of 655011601 in words is "six hundred fifty-five million, eleven thousand, six hundred one".