65684896240 has 40 divisors (see below), whose sum is σ = 156442205808. Its totient is φ = 25633128960.

The previous prime is 65684896231. The next prime is 65684896301. The reversal of 65684896240 is 4269848656.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×65684896240² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10009662 + ... + 10016221.

Almost surely, 2^65684896240 is an apocalyptic number.

It is an amenable number.

65684896240 is an abundant number, since it is smaller than the sum of its proper divisors (90757309568).

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

65684896240 is a wasteful number, since it uses less digits than its factorization.

65684896240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20025937 (or 20025931 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 65684896240 in words is "sixty-five billion, six hundred eighty-four million, eight hundred ninety-six thousand, two hundred forty".