208461421851 has 8 divisors (see below), whose sum is σ = 278012285760. Its totient is φ = 138942419592.

The previous prime is 208461421823. The next prime is 208461421859. The reversal of 208461421851 is 158124164802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 208461421851 - 2⁹ = 208461421339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208461421859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7950141 + ... + 7976318.

It is an arithmetic number, because the mean of its divisors is an integer number (34751535720).

Almost surely, 2^208461421851 is an apocalyptic number.

208461421851 is a deficient number, since it is larger than the sum of its proper divisors (69550863909).

208461421851 is a wasteful number, since it uses less digits than its factorization.

208461421851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15930825.

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 208461421851 in words is "two hundred eight billion, four hundred sixty-one million, four hundred twenty-one thousand, eight hundred fifty-one".