63651623 has 4 divisors (see below), whose sum is σ = 72744720. Its totient is φ = 54558528.

The previous prime is 63651611. The next prime is 63651647. The reversal of 63651623 is 32615636.

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

It is a cyclic number.

It is not a de Polignac number, because 63651623 - 2¹² = 63647527 is a prime.

It is a super-2 number, since 2×63651623² = 8103058221068258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63651623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63651673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4546538 + ... + 4546551.

It is an arithmetic number, because the mean of its divisors is an integer number (18186180).

Almost surely, 2^63651623 is an apocalyptic number.

63651623 is a deficient number, since it is larger than the sum of its proper divisors (9093097).

63651623 is an equidigital number, since it uses as much as digits as its factorization.

63651623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9093096.

The product of its digits is 19440, while the sum is 32.

The square root of 63651623 is about 7978.1967260779. The cubic root of 63651623 is about 399.2728936752.

The spelling of 63651623 in words is "sixty-three million, six hundred fifty-one thousand, six hundred twenty-three".