651320821273 has 2 divisors, whose sum is σ = 651320821274. Its totient is φ = 651320821272.

The previous prime is 651320821259. The next prime is 651320821301. The reversal of 651320821273 is 372128023156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 571947337984 + 79373483289 = 756272^2 + 281733^2 .

It is a cyclic number.

It is not a de Polignac number, because 651320821273 - 2⁵ = 651320821241 is a prime.

It is not a weakly prime, because it can be changed into another prime (651320821223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325660410636 + 325660410637.

It is an arithmetic number, because the mean of its divisors is an integer number (325660410637).

Almost surely, 2^651320821273 is an apocalyptic number.

It is an amenable number.

651320821273 is a deficient number, since it is larger than the sum of its proper divisors (1).

651320821273 is an equidigital number, since it uses as much as digits as its factorization.

651320821273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 651320821273 in words is "six hundred fifty-one billion, three hundred twenty million, eight hundred twenty-one thousand, two hundred seventy-three".