64561140236 has 24 divisors (see below), whose sum is σ = 114694463856. Its totient is φ = 31791513600.

The previous prime is 64561140233. The next prime is 64561140239. The reversal of 64561140236 is 63204116546.

It is an interprime number because it is at equal distance from previous prime (64561140233) and next prime (64561140239).

It is a self number, because there is not a number n which added to its sum of digits gives 64561140236.

It is not an unprimeable number, because it can be changed into a prime (64561140233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261580 + ... + 1311756.

It is an arithmetic number, because the mean of its divisors is an integer number (4778935994).

Almost surely, 2^64561140236 is an apocalyptic number.

It is an amenable number.

64561140236 is a deficient number, since it is larger than the sum of its proper divisors (50133323620).

64561140236 is a wasteful number, since it uses less digits than its factorization.

64561140236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55049 (or 55047 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 64561140236 in words is "sixty-four billion, five hundred sixty-one million, one hundred forty thousand, two hundred thirty-six".