1220504501551 has 8 divisors (see below), whose sum is σ = 1290401239680. Its totient is φ = 1151173729368.

The previous prime is 1220504501549. The next prime is 1220504501569. The reversal of 1220504501551 is 1551054050221.

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 1220504501551 - 2¹ = 1220504501549 is a prime.

It is a super-2 number, since 2×1220504501551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220504505551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141487051 + ... + 141495676.

It is an arithmetic number, because the mean of its divisors is an integer number (161300154960).

Almost surely, 2^{1220504501551} is an apocalyptic number.

1220504501551 is a deficient number, since it is larger than the sum of its proper divisors (69896738129).

1220504501551 is a wasteful number, since it uses less digits than its factorization.

1220504501551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282982973.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 1220504501551 its reverse (1551054050221), we get a palindrome (2771558551772).

The spelling of 1220504501551 in words is "one trillion, two hundred twenty billion, five hundred four million, five hundred one thousand, five hundred fifty-one".