210450778673 has 4 divisors (see below), whose sum is σ = 222830236260. Its totient is φ = 198071321088.

The previous prime is 210450778663. The next prime is 210450778679. The reversal of 210450778673 is 376877054012.

It is a happy number.

210450778673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 145857539569 + 64593239104 = 381913^2 + 254152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210450778673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (210450778679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6189728768 + ... + 6189728801.

It is an arithmetic number, because the mean of its divisors is an integer number (55707559065).

Almost surely, 2^210450778673 is an apocalyptic number.

It is an amenable number.

210450778673 is a deficient number, since it is larger than the sum of its proper divisors (12379457587).

210450778673 is a wasteful number, since it uses less digits than its factorization.

210450778673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12379457586.

The product of its (nonzero) digits is 1975680, while the sum is 50.

The spelling of 210450778673 in words is "two hundred ten billion, four hundred fifty million, seven hundred seventy-eight thousand, six hundred seventy-three".