1220511504551 has 8 divisors (see below), whose sum is σ = 1237720756608. Its totient is φ = 1203302779000.

The previous prime is 1220511504517. The next prime is 1220511504599. The reversal of 1220511504551 is 1554051150221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220511504551 - 2¹⁸ = 1220511242407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220511504451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8474936 + ... + 8617746.

It is an arithmetic number, because the mean of its divisors is an integer number (154715094576).

Almost surely, 2^{1220511504551} is an apocalyptic number.

1220511504551 is a deficient number, since it is larger than the sum of its proper divisors (17209252057).

1220511504551 is a wasteful number, since it uses less digits than its factorization.

1220511504551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263253.

The product of its (nonzero) digits is 10000, while the sum is 32.

Adding to 1220511504551 its reverse (1554051150221), we get a palindrome (2774562654772).

The spelling of 1220511504551 in words is "one trillion, two hundred twenty billion, five hundred eleven million, five hundred four thousand, five hundred fifty-one".