66305641 has 4 divisors (see below), whose sum is σ = 66782800. Its totient is φ = 65828484.

The previous prime is 66305639. The next prime is 66305677. The reversal of 66305641 is 14650366.

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 a cyclic number.

It is not a de Polignac number, because 66305641 - 2¹ = 66305639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66305341) 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, 238371 + ... + 238648.

It is an arithmetic number, because the mean of its divisors is an integer number (16695700).

Almost surely, 2^66305641 is an apocalyptic number.

It is an amenable number.

66305641 is a deficient number, since it is larger than the sum of its proper divisors (477159).

66305641 is a wasteful number, since it uses less digits than its factorization.

66305641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477158.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66305641 is about 8142.8275801468. The cubic root of 66305641 is about 404.7468641197.

The spelling of 66305641 in words is "sixty-six million, three hundred five thousand, six hundred forty-one".