66022091 has 4 divisors (see below), whose sum is σ = 66066000. Its totient is φ = 65978184.

The previous prime is 66022087. The next prime is 66022109. The reversal of 66022091 is 19022066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66022091 - 2² = 66022087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66022091.

It is not an unprimeable number, because it can be changed into a prime (66022051) 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, 19616 + ... + 22733.

It is an arithmetic number, because the mean of its divisors is an integer number (16516500).

Almost surely, 2^66022091 is an apocalyptic number.

66022091 is a deficient number, since it is larger than the sum of its proper divisors (43909).

66022091 is a wasteful number, since it uses less digits than its factorization.

66022091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43908.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 66022091 is about 8125.3978979494. The cubic root of 66022091 is about 404.1690854333.

The spelling of 66022091 in words is "sixty-six million, twenty-two thousand, ninety-one".