66622553 has 4 divisors (see below), whose sum is σ = 67714788. Its totient is φ = 65530320.

The previous prime is 66622511. The next prime is 66622573. The reversal of 66622553 is 35522666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12054784 + 54567769 = 3472^2 + 7387^2 .

It is a cyclic number.

It is not a de Polignac number, because 66622553 - 2¹² = 66618457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66622573) 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, 546026 + ... + 546147.

It is an arithmetic number, because the mean of its divisors is an integer number (16928697).

Almost surely, 2^66622553 is an apocalyptic number.

It is an amenable number.

66622553 is a deficient number, since it is larger than the sum of its proper divisors (1092235).

66622553 is a wasteful number, since it uses less digits than its factorization.

66622553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092234.

The product of its digits is 64800, while the sum is 35.

The square root of 66622553 is about 8162.2639628966. The cubic root of 66622553 is about 405.3906772271.

The spelling of 66622553 in words is "sixty-six million, six hundred twenty-two thousand, five hundred fifty-three".