65621230128 has 120 divisors (see below), whose sum is σ = 188244472416. Its totient is φ = 21326976000.

The previous prime is 65621230123. The next prime is 65621230141. The reversal of 65621230128 is 82103212656.

65621230128 is a `hidden beast` number, since 6 + 5 + 621 + 2 + 3 + 0 + 1 + 28 = 666.

It is a super-2 number, since 2×65621230128² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 65621230092 and 65621230101.

It is not an unprimeable number, because it can be changed into a prime (65621230121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15058926 + ... + 15063282.

Almost surely, 2^65621230128 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 65621230128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94122236208).

65621230128 is an abundant number, since it is smaller than the sum of its proper divisors (122623242288).

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

65621230128 is a wasteful number, since it uses less digits than its factorization.

65621230128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963 (or 6954 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 65621230128 in words is "sixty-five billion, six hundred twenty-one million, two hundred thirty thousand, one hundred twenty-eight".