66463864 has 8 divisors (see below), whose sum is σ = 124619760. Its totient is φ = 33231928.

The previous prime is 66463849. The next prime is 66463867. The reversal of 66463864 is 46836466.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66463864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66463867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4153984 + ... + 4153999.

It is an arithmetic number, because the mean of its divisors is an integer number (15577470).

Almost surely, 2^66463864 is an apocalyptic number.

It is an amenable number.

66463864 is a deficient number, since it is larger than the sum of its proper divisors (58155896).

66463864 is a wasteful number, since it uses less digits than its factorization.

66463864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8307989 (or 8307985 counting only the distinct ones).

The product of its digits is 497664, while the sum is 43.

The square root of 66463864 is about 8152.5372737572. The cubic root of 66463864 is about 405.0685531469.

The spelling of 66463864 in words is "sixty-six million, four hundred sixty-three thousand, eight hundred sixty-four".