66620153 has 4 divisors (see below), whose sum is σ = 66699108. Its totient is φ = 66541200.

The previous prime is 66620131. The next prime is 66620159. The reversal of 66620153 is 35102666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35102666 = 2 ⋅17551333.

It can be written as a sum of positive squares in 2 ways, for example, as 28217344 + 38402809 = 5312^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 66620153 - 2⁸ = 66619897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66620159) 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, 38198 + ... + 39903.

It is an arithmetic number, because the mean of its divisors is an integer number (16674777).

Almost surely, 2^66620153 is an apocalyptic number.

It is an amenable number.

66620153 is a deficient number, since it is larger than the sum of its proper divisors (78955).

66620153 is an equidigital number, since it uses as much as digits as its factorization.

66620153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78954.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66620153 is about 8162.1169435386. The cubic root of 66620153 is about 405.3858092594.

The spelling of 66620153 in words is "sixty-six million, six hundred twenty thousand, one hundred fifty-three".