820845924499 has 2 divisors, whose sum is σ = 820845924500. Its totient is φ = 820845924498.

The previous prime is 820845924473. The next prime is 820845924517. The reversal of 820845924499 is 994429548028.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820845924499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820845924499.

It is not a weakly prime, because it can be changed into another prime (820845924419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410422962249 + 410422962250.

It is an arithmetic number, because the mean of its divisors is an integer number (410422962250).

Almost surely, 2^820845924499 is an apocalyptic number.

820845924499 is a deficient number, since it is larger than the sum of its proper divisors (1).

820845924499 is an equidigital number, since it uses as much as digits as its factorization.

820845924499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 59719680, while the sum is 64.

The spelling of 820845924499 in words is "eight hundred twenty billion, eight hundred forty-five million, nine hundred twenty-four thousand, four hundred ninety-nine".