80265961921 has 2 divisors, whose sum is σ = 80265961922. Its totient is φ = 80265961920.

The previous prime is 80265961903. The next prime is 80265961943. The reversal of 80265961921 is 12916956208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78561923521 + 1704038400 = 280289^2 + 41280^2 .

It is a cyclic number.

It is not a de Polignac number, because 80265961921 - 2⁹ = 80265961409 is a prime.

It is not a weakly prime, because it can be changed into another prime (80265961981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40132980960 + 40132980961.

It is an arithmetic number, because the mean of its divisors is an integer number (40132980961).

Almost surely, 2^80265961921 is an apocalyptic number.

It is an amenable number.

80265961921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80265961921 is an equidigital number, since it uses as much as digits as its factorization.

80265961921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 80265961921 in words is "eighty billion, two hundred sixty-five million, nine hundred sixty-one thousand, nine hundred twenty-one".