6450661 has 4 divisors (see below), whose sum is σ = 7372192. Its totient is φ = 5529132.

The previous prime is 6450641. The next prime is 6450679. The reversal of 6450661 is 1660546.

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 6450661 - 2⁵ = 6450629 is a prime.

It is a super-2 number, since 2×6450661² = 83222054673842, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6450611) 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, 460755 + ... + 460768.

It is an arithmetic number, because the mean of its divisors is an integer number (1843048).

Almost surely, 2^6450661 is an apocalyptic number.

It is an amenable number.

6450661 is a deficient number, since it is larger than the sum of its proper divisors (921531).

6450661 is an equidigital number, since it uses as much as digits as its factorization.

6450661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921530.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 6450661 is about 2539.8151507541. The cubic root of 6450661 is about 186.1521570681.

The spelling of 6450661 in words is "six million, four hundred fifty thousand, six hundred sixty-one".