664142715 has 12 divisors (see below), whose sum is σ = 1151180784. Its totient is φ = 354209424.

The previous prime is 664142707. The next prime is 664142719. The reversal of 664142715 is 517241466.

664142715 is a `hidden beast` number, since 6 + 641 + 4 + 2 + 7 + 1 + 5 = 666.

It is not a de Polignac number, because 664142715 - 2³ = 664142707 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664142715.

It is not an unprimeable number, because it can be changed into a prime (664142719) 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, 7379319 + ... + 7379408.

It is an arithmetic number, because the mean of its divisors is an integer number (95931732).

Almost surely, 2^664142715 is an apocalyptic number.

664142715 is a deficient number, since it is larger than the sum of its proper divisors (487038069).

664142715 is a wasteful number, since it uses less digits than its factorization.

664142715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14758738 (or 14758735 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 664142715 is about 25770.9665127251. The cubic root of 664142715 is about 872.4766331183.

The spelling of 664142715 in words is "six hundred sixty-four million, one hundred forty-two thousand, seven hundred fifteen".