65553989 has 8 divisors (see below), whose sum is σ = 69665688. Its totient is φ = 61470720.

The previous prime is 65553977. The next prime is 65553991. The reversal of 65553989 is 98935556.

It can be written as a sum of positive squares in 4 ways, for example, as 10349089 + 55204900 = 3217^2 + 7430^2 .

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 65553989 - 2¹⁶ = 65488453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65553919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2252 + ... + 11669.

It is an arithmetic number, because the mean of its divisors is an integer number (8708211).

Almost surely, 2^65553989 is an apocalyptic number.

It is an amenable number.

65553989 is a deficient number, since it is larger than the sum of its proper divisors (4111699).

65553989 is a wasteful number, since it uses less digits than its factorization.

65553989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14215.

The product of its digits is 1458000, while the sum is 50.

The square root of 65553989 is about 8096.5417926421. The cubic root of 65553989 is about 403.2116217840.

The spelling of 65553989 in words is "sixty-five million, five hundred fifty-three thousand, nine hundred eighty-nine".