6661615 has 8 divisors (see below), whose sum is σ = 8103888. Its totient is φ = 5256000.

The previous prime is 6661601. The next prime is 6661643. The reversal of 6661615 is 5161666.

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

It is not a de Polignac number, because 6661615 - 2⁵ = 6661583 is a prime.

It is a super-2 number, since 2×6661615² = 88754228816450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8761 + ... + 9490.

It is an arithmetic number, because the mean of its divisors is an integer number (1012986).

Almost surely, 2^6661615 is an apocalyptic number.

6661615 is a deficient number, since it is larger than the sum of its proper divisors (1442273).

6661615 is a wasteful number, since it uses less digits than its factorization.

6661615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18329.

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

The square root of 6661615 is about 2581.0104610404. The cubic root of 6661615 is about 188.1596557604.

The spelling of 6661615 in words is "six million, six hundred sixty-one thousand, six hundred fifteen".