65699438047488 has 324 divisors, whose sum is σ = 222626378711100. Its totient is φ = 18577746690048.

The previous prime is 65699438047487. The next prime is 65699438047489. The reversal of 65699438047488 is 88474083499656.

65699438047488 is a `hidden beast` number, since 6 + 5 + 6 + 9 + 94 + 3 + 8 + 0 + 47 + 488 = 666.

It is an interprime number because it is at equal distance from previous prime (65699438047487) and next prime (65699438047489).

It can be written as a sum of positive squares in 2 ways, for example, as 31530830413824 + 34168607633664 = 5615232^2 + 5845392^2 .

It is a super-2 number, since 2×65699438047488² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65699438047487) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7951188 + ... + 13950636.

Almost surely, 2^{65699438047488} 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 65699438047488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111313189355550).

65699438047488 is an abundant number, since it is smaller than the sum of its proper divisors (156926940663612).

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

65699438047488 is a wasteful number, since it uses less digits than its factorization.

65699438047488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999582 (or 5999558 counting only the distinct ones).

The product of its (nonzero) digits is 10032906240, while the sum is 81.

The spelling of 65699438047488 in words is "sixty-five trillion, six hundred ninety-nine billion, four hundred thirty-eight million, forty-seven thousand, four hundred eighty-eight".