6437661 has 8 divisors (see below), whose sum is σ = 8609280. Its totient is φ = 4278912.

The previous prime is 6437657. The next prime is 6437663. The reversal of 6437661 is 1667346.

6437661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6437661 - 2² = 6437657 is a prime.

It is a super-4 number, since 4×6437661⁴ (a number of 28 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6437663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1981 + ... + 4098.

It is an arithmetic number, because the mean of its divisors is an integer number (1076160).

Almost surely, 2^6437661 is an apocalyptic number.

It is an amenable number.

6437661 is a deficient number, since it is larger than the sum of its proper divisors (2171619).

6437661 is a wasteful number, since it uses less digits than its factorization.

6437661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435.

The product of its digits is 18144, while the sum is 33.

The square root of 6437661 is about 2537.2546186774. The cubic root of 6437661 is about 186.0270223198.

The spelling of 6437661 in words is "six million, four hundred thirty-seven thousand, six hundred sixty-one".