821649262051 has 2 divisors, whose sum is σ = 821649262052. Its totient is φ = 821649262050.

The previous prime is 821649262043. The next prime is 821649262069. The reversal of 821649262051 is 150262946128.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 821649262051 - 2³ = 821649262043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821649261992 and 821649262010.

It is not a weakly prime, because it can be changed into another prime (821649263051) by changing a digit.

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 as a sum of consecutive naturals, namely, 410824631025 + 410824631026.

It is an arithmetic number, because the mean of its divisors is an integer number (410824631026).

Almost surely, 2^821649262051 is an apocalyptic number.

821649262051 is a deficient number, since it is larger than the sum of its proper divisors (1).

821649262051 is an equidigital number, since it uses as much as digits as its factorization.

821649262051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 821649262051 in words is "eight hundred twenty-one billion, six hundred forty-nine million, two hundred sixty-two thousand, fifty-one".