66001653 has 12 divisors (see below), whose sum is σ = 95553900. Its totient is φ = 43900416.

The previous prime is 66001631. The next prime is 66001657. The reversal of 66001653 is 35610066.

66001653 is a `hidden beast` number, since 6 + 6 + 0 + 0 + 1 + 653 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20277009 + 45724644 = 4503^2 + 6762^2 .

It is not a de Polignac number, because 66001653 - 2⁹ = 66001141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66001657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4126 + ... + 12207.

It is an arithmetic number, because the mean of its divisors is an integer number (7962825).

Almost surely, 2^66001653 is an apocalyptic number.

It is an amenable number.

66001653 is a deficient number, since it is larger than the sum of its proper divisors (29552247).

66001653 is a wasteful number, since it uses less digits than its factorization.

66001653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16788 (or 16785 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 66001653 is about 8124.1401391163. The cubic root of 66001653 is about 404.1273758572.

The spelling of 66001653 in words is "sixty-six million, one thousand, six hundred fifty-three".