78663553 has 8 divisors (see below), whose sum is σ = 83048000. Its totient is φ = 74303568.

The previous prime is 78663521. The next prime is 78663577. The reversal of 78663553 is 35536687.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78663553 - 2⁵ = 78663521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78663503) 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 in 7 ways as a sum of consecutive naturals, for example, 700 + ... + 12562.

It is an arithmetic number, because the mean of its divisors is an integer number (10381000).

Almost surely, 2^78663553 is an apocalyptic number.

It is an amenable number.

78663553 is a deficient number, since it is larger than the sum of its proper divisors (4384447).

78663553 is a wasteful number, since it uses less digits than its factorization.

78663553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231.

The product of its digits is 453600, while the sum is 43.

The square root of 78663553 is about 8869.2476005578. The cubic root of 78663553 is about 428.4740449580.

The spelling of 78663553 in words is "seventy-eight million, six hundred sixty-three thousand, five hundred fifty-three".