65399899356 has 216 divisors, whose sum is σ = 187832556912. Its totient is φ = 19160064000.

The previous prime is 65399899343. The next prime is 65399899361.

65399899356 is a `hidden beast` number, since 6 + 539 + 9 + 89 + 9 + 3 + 5 + 6 = 666.

65399899356 is nontrivially palindromic in base 10.

65399899356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18916380 + ... + 18919836.

Almost surely, 2^65399899356 is an apocalyptic number.

65399899356 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65399899356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93916278456).

65399899356 is an abundant number, since it is smaller than the sum of its proper divisors (122432657556).

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

65399899356 is a wasteful number, since it uses less digits than its factorization.

65399899356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633 (or 3617 counting only the distinct ones).

The product of its digits is 425152800, while the sum is 72.

The spelling of 65399899356 in words is "sixty-five billion, three hundred ninety-nine million, eight hundred ninety-nine thousand, three hundred fifty-six".