66095021 has 4 divisors (see below), whose sum is σ = 66112032. Its totient is φ = 66078012.

The previous prime is 66095011. The next prime is 66095023. The reversal of 66095021 is 12059066.

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 a de Polignac number, because none of the positive numbers 2^k-66095021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66095023) 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, 506 + ... + 11508.

It is an arithmetic number, because the mean of its divisors is an integer number (16528008).

Almost surely, 2^66095021 is an apocalyptic number.

It is an amenable number.

66095021 is a deficient number, since it is larger than the sum of its proper divisors (17011).

66095021 is a wasteful number, since it uses less digits than its factorization.

66095021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17010.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 66095021 is about 8129.8844395231. The cubic root of 66095021 is about 404.3178498051.

The spelling of 66095021 in words is "sixty-six million, ninety-five thousand, twenty-one".