655402161 has 4 divisors (see below), whose sum is σ = 873869552. Its totient is φ = 436934772.

The previous prime is 655402159. The next prime is 655402193. The reversal of 655402161 is 161204556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 655402161 - 2¹ = 655402159 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (655402661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109233691 + ... + 109233696.

It is an arithmetic number, because the mean of its divisors is an integer number (218467388).

Almost surely, 2^655402161 is an apocalyptic number.

It is an amenable number.

655402161 is a deficient number, since it is larger than the sum of its proper divisors (218467391).

655402161 is a wasteful number, since it uses less digits than its factorization.

655402161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218467390.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 655402161 is about 25600.8234437879. The cubic root of 655402161 is about 868.6322636299.

The spelling of 655402161 in words is "six hundred fifty-five million, four hundred two thousand, one hundred sixty-one".