1220154478401 has 8 divisors (see below), whose sum is σ = 1661486949504. Its totient is φ = 796129163120.

The previous prime is 1220154478397. The next prime is 1220154478423. The reversal of 1220154478401 is 1048744510221.

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 1220154478401 - 2² = 1220154478397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220154478401.

It is not an unprimeable number, because it can be changed into a prime (1220154478441) 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, 4326788790 + ... + 4326789071.

It is an arithmetic number, because the mean of its divisors is an integer number (207685868688).

Almost surely, 2^{1220154478401} is an apocalyptic number.

It is an amenable number.

1220154478401 is a deficient number, since it is larger than the sum of its proper divisors (441332471103).

1220154478401 is an equidigital number, since it uses as much as digits as its factorization.

1220154478401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8653577911.

The product of its (nonzero) digits is 71680, while the sum is 39.

Adding to 1220154478401 its reverse (1048744510221), we get a palindrome (2268898988622).

The spelling of 1220154478401 in words is "one trillion, two hundred twenty billion, one hundred fifty-four million, four hundred seventy-eight thousand, four hundred one".