66411669 has 16 divisors (see below), whose sum is σ = 93401280. Its totient is φ = 41857920.

The previous prime is 66411661. The next prime is 66411671. The reversal of 66411669 is 96611466.

It is not a de Polignac number, because 66411669 - 2³ = 66411661 is a prime.

It is a super-2 number, since 2×66411669² = 8821019558731122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66411661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37729 + ... + 39449.

It is an arithmetic number, because the mean of its divisors is an integer number (5837580).

Almost surely, 2^66411669 is an apocalyptic number.

It is an amenable number.

66411669 is a deficient number, since it is larger than the sum of its proper divisors (26989611).

66411669 is a wasteful number, since it uses less digits than its factorization.

66411669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420.

The product of its digits is 46656, while the sum is 39.

The square root of 66411669 is about 8149.3354943823. The cubic root of 66411669 is about 404.9624900484.

The spelling of 66411669 in words is "sixty-six million, four hundred eleven thousand, six hundred sixty-nine".