823978524851 has 2 divisors, whose sum is σ = 823978524852. Its totient is φ = 823978524850.

The previous prime is 823978524841. The next prime is 823978524871. The reversal of 823978524851 is 158425879328.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 823978524851 - 2¹⁴ = 823978508467 is a prime.

It is not a weakly prime, because it can be changed into another prime (823978524841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411989262425 + 411989262426.

It is an arithmetic number, because the mean of its divisors is an integer number (411989262426).

Almost surely, 2^823978524851 is an apocalyptic number.

823978524851 is a deficient number, since it is larger than the sum of its proper divisors (1).

823978524851 is an equidigital number, since it uses as much as digits as its factorization.

823978524851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38707200, while the sum is 62.

The spelling of 823978524851 in words is "eight hundred twenty-three billion, nine hundred seventy-eight million, five hundred twenty-four thousand, eight hundred fifty-one".