6355661 has 4 divisors (see below), whose sum is σ = 6844572. Its totient is φ = 5866752.

The previous prime is 6355631. The next prime is 6355667. The reversal of 6355661 is 1665536.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504100 + 5851561 = 710^2 + 2419^2 .

It is a cyclic number.

It is not a de Polignac number, because 6355661 - 2⁶ = 6355597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6355667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244436 + ... + 244461.

It is an arithmetic number, because the mean of its divisors is an integer number (1711143).

Almost surely, 2^6355661 is an apocalyptic number.

It is an amenable number.

6355661 is a deficient number, since it is larger than the sum of its proper divisors (488911).

6355661 is a wasteful number, since it uses less digits than its factorization.

6355661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488910.

The product of its digits is 16200, while the sum is 32.

The square root of 6355661 is about 2521.0436331012. The cubic root of 6355661 is about 185.2338022788.

The spelling of 6355661 in words is "six million, three hundred fifty-five thousand, six hundred sixty-one".