821649262043 has 2 divisors, whose sum is σ = 821649262044. Its totient is φ = 821649262042.

The previous prime is 821649261997. The next prime is 821649262051. The reversal of 821649262043 is 340262946128.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-821649262043 is a prime.

It is not a weakly prime, because it can be changed into another prime (821649262073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410824631021 + 410824631022.

It is an arithmetic number, because the mean of its divisors is an integer number (410824631022).

Almost surely, 2^821649262043 is an apocalyptic number.

821649262043 is a deficient number, since it is larger than the sum of its proper divisors (1).

821649262043 is an equidigital number, since it uses as much as digits as its factorization.

821649262043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 821649262043 in words is "eight hundred twenty-one billion, six hundred forty-nine million, two hundred sixty-two thousand, forty-three".