65506543440 has 160 divisors (see below), whose sum is σ = 224602041216. Its totient is φ = 15688857600.

The previous prime is 65506543439. The next prime is 65506543489. The reversal of 65506543440 is 4434560556.

It is a super-2 number, since 2×65506543440² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65506543392 and 65506543401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168286 + ... + 399165.

Almost surely, 2^65506543440 is an apocalyptic number.

65506543440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65506543440 is an abundant number, since it is smaller than the sum of its proper divisors (159095497776).

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

65506543440 is a wasteful number, since it uses less digits than its factorization.

65506543440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567517 (or 567511 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 65506543440 in words is "sixty-five billion, five hundred six million, five hundred forty-three thousand, four hundred forty".