66022661 has 4 divisors (see below), whose sum is σ = 66427872. Its totient is φ = 65617452.

The previous prime is 66022657. The next prime is 66022667. The reversal of 66022661 is 16622066.

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 66022661 - 2² = 66022657 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 (66022667) 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, 202361 + ... + 202686.

It is an arithmetic number, because the mean of its divisors is an integer number (16606968).

Almost surely, 2^66022661 is an apocalyptic number.

It is an amenable number.

66022661 is a deficient number, since it is larger than the sum of its proper divisors (405211).

66022661 is a wasteful number, since it uses less digits than its factorization.

66022661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405210.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 66022661 is about 8125.4329730790. The cubic root of 66022661 is about 404.1702485577.

The spelling of 66022661 in words is "sixty-six million, twenty-two thousand, six hundred sixty-one".