6156661 has 4 divisors (see below), whose sum is σ = 7036192. Its totient is φ = 5277132.

The previous prime is 6156659. The next prime is 6156713. The reversal of 6156661 is 1666516.

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 6156661 - 2¹ = 6156659 is a prime.

It is a Duffinian number.

6156661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6156641) 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, 439755 + ... + 439768.

It is an arithmetic number, because the mean of its divisors is an integer number (1759048).

Almost surely, 2^6156661 is an apocalyptic number.

It is an amenable number.

6156661 is a deficient number, since it is larger than the sum of its proper divisors (879531).

6156661 is an equidigital number, since it uses as much as digits as its factorization.

6156661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879530.

The product of its digits is 6480, while the sum is 31.

The square root of 6156661 is about 2481.2619773011. The cubic root of 6156661 is about 183.2800017509.

The spelling of 6156661 in words is "six million, one hundred fifty-six thousand, six hundred sixty-one".