2651561465321 has 2 divisors, whose sum is σ = 2651561465322. Its totient is φ = 2651561465320.

The previous prime is 2651561465261. The next prime is 2651561465339. The reversal of 2651561465321 is 1235641651562.

It is a happy number.

2651561465321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1829429374096 + 822132091225 = 1352564^2 + 906715^2 .

It is a cyclic number.

It is not a de Polignac number, because 2651561465321 - 2⁶ = 2651561465257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2651561465341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325780732660 + 1325780732661.

It is an arithmetic number, because the mean of its divisors is an integer number (1325780732661).

Almost surely, 2^{2651561465321} is an apocalyptic number.

It is an amenable number.

2651561465321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2651561465321 is an equidigital number, since it uses as much as digits as its factorization.

2651561465321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 47.

The spelling of 2651561465321 in words is "two trillion, six hundred fifty-one billion, five hundred sixty-one million, four hundred sixty-five thousand, three hundred twenty-one".