840242497666 has 32 divisors (see below), whose sum is σ = 1483651064448. Its totient is φ = 351848346240.

The previous prime is 840242497639. The next prime is 840242497739. The reversal of 840242497666 is 666794242048.

It is a self number, because there is not a number n which added to its sum of digits gives 840242497666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776531 + ... + 3064246.

It is an arithmetic number, because the mean of its divisors is an integer number (46364095764).

Almost surely, 2^840242497666 is an apocalyptic number.

840242497666 is a deficient number, since it is larger than the sum of its proper divisors (643408566782).

840242497666 is a wasteful number, since it uses less digits than its factorization.

840242497666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5841306.

The product of its (nonzero) digits is 27869184, while the sum is 58.

The spelling of 840242497666 in words is "eight hundred forty billion, two hundred forty-two million, four hundred ninety-seven thousand, six hundred sixty-six".