823451668242 has 64 divisors (see below), whose sum is σ = 2000300417280. Its totient is φ = 220609161216.

The previous prime is 823451668231. The next prime is 823451668261. The reversal of 823451668242 is 242866154328.

It is a Harshad number since it is a multiple of its sum of digits (51).

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 31 ways as a sum of consecutive naturals, for example, 1951603 + ... + 2335734.

It is an arithmetic number, because the mean of its divisors is an integer number (31254694020).

Almost surely, 2^823451668242 is an apocalyptic number.

823451668242 is an abundant number, since it is smaller than the sum of its proper divisors (1176848749038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

823451668242 is a wasteful number, since it uses less digits than its factorization.

823451668242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4287635.

The product of its digits is 4423680, while the sum is 51.

The spelling of 823451668242 in words is "eight hundred twenty-three billion, four hundred fifty-one million, six hundred sixty-eight thousand, two hundred forty-two".