65553399 has 6 divisors (see below), whose sum is σ = 94688256. Its totient is φ = 43702260.

The previous prime is 65553361. The next prime is 65553407. The reversal of 65553399 is 99335556.

It is a happy number.

65553399 is a `hidden beast` number, since 6 + 5 + 553 + 3 + 99 = 666.

It is not a de Polignac number, because 65553399 - 2⁸ = 65553143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65553329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3641847 + ... + 3641864.

It is an arithmetic number, because the mean of its divisors is an integer number (15781376).

Almost surely, 2^65553399 is an apocalyptic number.

65553399 is a deficient number, since it is larger than the sum of its proper divisors (29134857).

65553399 is a wasteful number, since it uses less digits than its factorization.

65553399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283717 (or 7283714 counting only the distinct ones).

The product of its digits is 546750, while the sum is 45.

The square root of 65553399 is about 8096.5053572514. The cubic root of 65553399 is about 403.2104121166.

The spelling of 65553399 in words is "sixty-five million, five hundred fifty-three thousand, three hundred ninety-nine".