6665531 has 8 divisors (see below), whose sum is σ = 6841824. Its totient is φ = 6491520.

The previous prime is 6665497. The next prime is 6665537. The reversal of 6665531 is 1355666.

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

It is a cyclic number.

It is not a de Polignac number, because 6665531 - 2¹⁸ = 6403387 is a prime.

It is a super-2 number, since 2×6665531² = 88858607023922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6665537) 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, 6410 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (855228).

Almost surely, 2^6665531 is an apocalyptic number.

6665531 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6665531 is a deficient number, since it is larger than the sum of its proper divisors (176293).

6665531 is a wasteful number, since it uses less digits than its factorization.

6665531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141.

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

The square root of 6665531 is about 2581.7689672006. The cubic root of 6665531 is about 188.1965181368.

The spelling of 6665531 in words is "six million, six hundred sixty-five thousand, five hundred thirty-one".