65551420 has 48 divisors (see below), whose sum is σ = 154250208. Its totient is φ = 23189760.

The previous prime is 65551379. The next prime is 65551429. The reversal of 65551420 is 2415556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65551429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4114 + ... + 12166.

It is an arithmetic number, because the mean of its divisors is an integer number (3213546).

Almost surely, 2^65551420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65551420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77125104).

65551420 is an abundant number, since it is smaller than the sum of its proper divisors (88698788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65551420 is a wasteful number, since it uses less digits than its factorization.

65551420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110 (or 8108 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 65551420 is about 8096.3831431078. The cubic root of 65551420 is about 403.2063545521.

Adding to 65551420 its reverse (2415556), we get a palindrome (67966976).

The spelling of 65551420 in words is "sixty-five million, five hundred fifty-one thousand, four hundred twenty".