63556961 has 4 divisors (see below), whose sum is σ = 68445972. Its totient is φ = 58667952.

The previous prime is 63556949. The next prime is 63556973. The reversal of 63556961 is 16965536.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (63556949) and next prime (63556973).

It can be written as a sum of positive squares in 2 ways, for example, as 15171025 + 48385936 = 3895^2 + 6956^2 .

It is a cyclic number.

It is not a de Polignac number, because 63556961 - 2¹⁸ = 63294817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63556991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2444486 + ... + 2444511.

It is an arithmetic number, because the mean of its divisors is an integer number (17111493).

Almost surely, 2^63556961 is an apocalyptic number.

It is an amenable number.

63556961 is a deficient number, since it is larger than the sum of its proper divisors (4889011).

63556961 is a wasteful number, since it uses less digits than its factorization.

63556961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889010.

The product of its digits is 145800, while the sum is 41.

The square root of 63556961 is about 7972.2619751235. The cubic root of 63556961 is about 399.0748640416.

The spelling of 63556961 in words is "sixty-three million, five hundred fifty-six thousand, nine hundred sixty-one".