66063987 has 24 divisors (see below), whose sum is σ = 105431040. Its totient is φ = 39527280.

The previous prime is 66063983. The next prime is 66064043. The reversal of 66063987 is 78936066.

66063987 is a `hidden beast` number, since 6 + 6 + 0 + 639 + 8 + 7 = 666.

It is not a de Polignac number, because 66063987 - 2² = 66063983 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66063983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3598 + ... + 12044.

It is an arithmetic number, because the mean of its divisors is an integer number (4392960).

Almost surely, 2^66063987 is an apocalyptic number.

66063987 is a deficient number, since it is larger than the sum of its proper divisors (39367053).

66063987 is a wasteful number, since it uses less digits than its factorization.

66063987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8543 (or 8540 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66063987 is about 8127.9755782113. The cubic root of 66063987 is about 404.2545592862.

The spelling of 66063987 in words is "sixty-six million, sixty-three thousand, nine hundred eighty-seven".