216542742117658 has 16 divisors (see below), whose sum is σ = 354357595121760. Its totient is φ = 98424372977200.

The previous prime is 216542742117613. The next prime is 216542742117659. The reversal of 216542742117658 is 856711247245612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 216542742117596 and 216542742117605.

It is not an unprimeable number, because it can be changed into a prime (216542742117659) 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, 206774188 + ... + 207818791.

It is an arithmetic number, because the mean of its divisors is an integer number (22147349695110).

Almost surely, 2^{216542742117658} is an apocalyptic number.

216542742117658 is a deficient number, since it is larger than the sum of its proper divisors (137814853004102).

216542742117658 is a wasteful number, since it uses less digits than its factorization.

216542742117658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414616733.

The product of its digits is 45158400, while the sum is 61.

The spelling of 216542742117658 in words is "two hundred sixteen trillion, five hundred forty-two billion, seven hundred forty-two million, one hundred seventeen thousand, six hundred fifty-eight".