64663556 has 6 divisors (see below), whose sum is σ = 113161230. Its totient is φ = 32331776.

The previous prime is 64663553. The next prime is 64663559. The reversal of 64663556 is 65536646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64663553) and next prime (64663559).

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 4910656 = 7730^2 + 2216^2 .

It is not an unprimeable number, because it can be changed into a prime (64663553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082941 + ... + 8082948.

It is an arithmetic number, because the mean of its divisors is an integer number (18860205).

Almost surely, 2^64663556 is an apocalyptic number.

It is an amenable number.

64663556 is a deficient number, since it is larger than the sum of its proper divisors (48497674).

64663556 is a wasteful number, since it uses less digits than its factorization.

64663556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16165893 (or 16165891 counting only the distinct ones).

The product of its digits is 388800, while the sum is 41.

The square root of 64663556 is about 8041.3653069613. The cubic root of 64663556 is about 401.3776580319.

The spelling of 64663556 in words is "sixty-four million, six hundred sixty-three thousand, five hundred fifty-six".