1220504532551 has 2 divisors, whose sum is σ = 1220504532552. Its totient is φ = 1220504532550.

The previous prime is 1220504532529. The next prime is 1220504532563. The reversal of 1220504532551 is 1552354050221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220504532551 - 2¹⁴ = 1220504516167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220504532251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610252266275 + 610252266276.

It is an arithmetic number, because the mean of its divisors is an integer number (610252266276).

Almost surely, 2^{1220504532551} is an apocalyptic number.

1220504532551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220504532551 is an equidigital number, since it uses as much as digits as its factorization.

1220504532551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 1220504532551 its reverse (1552354050221), we get a palindrome (2772858582772).

The spelling of 1220504532551 in words is "one trillion, two hundred twenty billion, five hundred four million, five hundred thirty-two thousand, five hundred fifty-one".