65516666040 has 192 divisors, whose sum is σ = 251197839360. Its totient is φ = 14492148480.

The previous prime is 65516665997. The next prime is 65516666041. The reversal of 65516666040 is 4066661556.

65516666040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65516666041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341214 + ... + 497453.

It is an arithmetic number, because the mean of its divisors is an integer number (1308322080).

Almost surely, 2^65516666040 is an apocalyptic number.

65516666040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65516666040 is an abundant number, since it is smaller than the sum of its proper divisors (185681173320).

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

65516666040 is a wasteful number, since it uses less digits than its factorization.

65516666040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838722 (or 838715 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 65516666040 in words is "sixty-five billion, five hundred sixteen million, six hundred sixty-six thousand, forty".