65540042605049 has 4 divisors (see below), whose sum is σ = 65542625692836. Its totient is φ = 65537459517264.

The previous prime is 65540042605007. The next prime is 65540042605069. The reversal of 65540042605049 is 94050624004556.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22156150249024 + 43383892356025 = 4707032^2 + 6586645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65540042605049 is a prime.

It is a super-2 number, since 2×65540042605049² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65540042604988 and 65540042605006.

It is not an unprimeable number, because it can be changed into a prime (65540042605069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291505834 + ... + 1291556579.

It is an arithmetic number, because the mean of its divisors is an integer number (16385656423209).

Almost surely, 2^{65540042605049} is an apocalyptic number.

It is an amenable number.

65540042605049 is a deficient number, since it is larger than the sum of its proper divisors (2583087787).

65540042605049 is a wasteful number, since it uses less digits than its factorization.

65540042605049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583087786.

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 65540042605049 in words is "sixty-five trillion, five hundred forty billion, forty-two million, six hundred five thousand, forty-nine".