1220442345261 has 16 divisors (see below), whose sum is σ = 1838707867200. Its totient is φ = 799837920144.

The previous prime is 1220442345211. The next prime is 1220442345271. The reversal of 1220442345261 is 1625432440221.

1220442345261 is a `hidden beast` number, since 1 + 2 + 204 + 423 + 4 + 5 + 26 + 1 = 666.

It is not a de Polignac number, because 1220442345261 - 2¹⁸ = 1220442083117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220442345211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383062546 + ... + 383065731.

It is an arithmetic number, because the mean of its divisors is an integer number (114919241700).

Almost surely, 2^{1220442345261} is an apocalyptic number.

It is an amenable number.

1220442345261 is a deficient number, since it is larger than the sum of its proper divisors (618265521939).

1220442345261 is an equidigital number, since it uses as much as digits as its factorization.

1220442345261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766128345 (or 766128339 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 1220442345261 its reverse (1625432440221), we get a palindrome (2845874785482).

The spelling of 1220442345261 in words is "one trillion, two hundred twenty billion, four hundred forty-two million, three hundred forty-five thousand, two hundred sixty-one".