66144535 has 16 divisors (see below), whose sum is σ = 86001696. Its totient is φ = 48642048.

The previous prime is 66144509. The next prime is 66144541. The reversal of 66144535 is 53544166.

It is a cyclic number.

It is not a de Polignac number, because 66144535 - 2⁵ = 66144503 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 66144535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5394 + ... + 12703.

It is an arithmetic number, because the mean of its divisors is an integer number (5375106).

Almost surely, 2^66144535 is an apocalyptic number.

66144535 is a deficient number, since it is larger than the sum of its proper divisors (19857161).

66144535 is a wasteful number, since it uses less digits than its factorization.

66144535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18162.

The product of its digits is 43200, while the sum is 34.

The square root of 66144535 is about 8132.9290541600. The cubic root of 66144535 is about 404.4187872974.

The spelling of 66144535 in words is "sixty-six million, one hundred forty-four thousand, five hundred thirty-five".