664142591 has 16 divisors (see below), whose sum is σ = 772789248. Its totient is φ = 559003200.

The previous prime is 664142581. The next prime is 664142593. The reversal of 664142591 is 195241466.

It is a de Polignac number, because none of the positive numbers 2^k-664142591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664142593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128171 + ... + 133251.

It is an arithmetic number, because the mean of its divisors is an integer number (48299328).

Almost surely, 2^664142591 is an apocalyptic number.

664142591 is a deficient number, since it is larger than the sum of its proper divisors (108646657).

664142591 is a wasteful number, since it uses less digits than its factorization.

664142591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422.

The product of its digits is 51840, while the sum is 38.

The square root of 664142591 is about 25770.9641069169. The cubic root of 664142591 is about 872.4765788192.

The spelling of 664142591 in words is "six hundred sixty-four million, one hundred forty-two thousand, five hundred ninety-one".