1220520532457 has 2 divisors, whose sum is σ = 1220520532458. Its totient is φ = 1220520532456.

The previous prime is 1220520532433. The next prime is 1220520532481. The reversal of 1220520532457 is 7542350250221.

It is a balanced prime because it is at equal distance from previous prime (1220520532433) and next prime (1220520532481).

It can be written as a sum of positive squares in only one way, i.e., 1212423412201 + 8097120256 = 1101101^2 + 89984^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220520532457 - 2¹² = 1220520528361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220520532457.

It is not a weakly prime, because it can be changed into another prime (1220520532417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610260266228 + 610260266229.

It is an arithmetic number, because the mean of its divisors is an integer number (610260266229).

Almost surely, 2^{1220520532457} is an apocalyptic number.

It is an amenable number.

1220520532457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220520532457 is an equidigital number, since it uses as much as digits as its factorization.

1220520532457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 38.

Adding to 1220520532457 its reverse (7542350250221), we get a palindrome (8762870782678).

The spelling of 1220520532457 in words is "one trillion, two hundred twenty billion, five hundred twenty million, five hundred thirty-two thousand, four hundred fifty-seven".