65640338040 has 32 divisors (see below), whose sum is σ = 196921014480. Its totient is φ = 17504090112.

The previous prime is 65640338017. The next prime is 65640338047. The reversal of 65640338040 is 4083304656.

It is a self number, because there is not a number n which added to its sum of digits gives 65640338040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65640338047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273501289 + ... + 273501528.

Almost surely, 2^65640338040 is an apocalyptic number.

65640338040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65640338040 is an abundant number, since it is smaller than the sum of its proper divisors (131280676440).

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

65640338040 is a wasteful number, since it uses less digits than its factorization.

65640338040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547002831 (or 547002827 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 65640338040 in words is "sixty-five billion, six hundred forty million, three hundred thirty-eight thousand, forty".