137220647761 has 2 divisors, whose sum is σ = 137220647762. Its totient is φ = 137220647760.

The previous prime is 137220647749. The next prime is 137220647777. The reversal of 137220647761 is 167746022731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131211297361 + 6009350400 = 362231^2 + 77520^2 .

It is a cyclic number.

It is not a de Polignac number, because 137220647761 - 2¹⁷ = 137220516689 is a prime.

It is not a weakly prime, because it can be changed into another prime (137220647701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68610323880 + 68610323881.

It is an arithmetic number, because the mean of its divisors is an integer number (68610323881).

Almost surely, 2^137220647761 is an apocalyptic number.

It is an amenable number.

137220647761 is a deficient number, since it is larger than the sum of its proper divisors (1).

137220647761 is an equidigital number, since it uses as much as digits as its factorization.

137220647761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 46.

The spelling of 137220647761 in words is "one hundred thirty-seven billion, two hundred twenty million, six hundred forty-seven thousand, seven hundred sixty-one".