820864901242 has 8 divisors (see below), whose sum is σ = 1231599671316. Its totient is φ = 410331677472.

The previous prime is 820864901209. The next prime is 820864901317. The reversal of 820864901242 is 242109468028.

It can be written as a sum of positive squares in 2 ways, for example, as 588520656801 + 232344244441 = 767151^2 + 482021^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 820864901192 and 820864901201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50376393 + ... + 50392684.

Almost surely, 2^820864901242 is an apocalyptic number.

820864901242 is a deficient number, since it is larger than the sum of its proper divisors (410734770074).

820864901242 is a wasteful number, since it uses less digits than its factorization.

820864901242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100773152.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 820864901242 in words is "eight hundred twenty billion, eight hundred sixty-four million, nine hundred one thousand, two hundred forty-two".