1220620122457 has 4 divisors (see below), whose sum is σ = 1221232578100. Its totient is φ = 1220007666816.

The previous prime is 1220620122431. The next prime is 1220620122521. The reversal of 1220620122457 is 7542210260221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 723008389401 + 497611733056 = 850299^2 + 705416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220620122457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220620122857) 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 3 ways as a sum of consecutive naturals, for example, 306224832 + ... + 306228817.

It is an arithmetic number, because the mean of its divisors is an integer number (305308144525).

Almost surely, 2^{1220620122457} is an apocalyptic number.

It is an amenable number.

1220620122457 is a deficient number, since it is larger than the sum of its proper divisors (612455643).

1220620122457 is an equidigital number, since it uses as much as digits as its factorization.

1220620122457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612455642.

The product of its (nonzero) digits is 26880, while the sum is 34.

Adding to 1220620122457 its reverse (7542210260221), we get a palindrome (8762830382678).

The spelling of 1220620122457 in words is "one trillion, two hundred twenty billion, six hundred twenty million, one hundred twenty-two thousand, four hundred fifty-seven".