1220355525442 has 4 divisors (see below), whose sum is σ = 1830533288166. Its totient is φ = 610177762720.

The previous prime is 1220355525437. The next prime is 1220355525449. The reversal of 1220355525442 is 2445255530221.

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

It can be written as a sum of positive squares in only one way, i.e., 1062777489921 + 157578035521 = 1030911^2 + 396961^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220355525395 and 1220355525404.

It is not an unprimeable number, because it can be changed into a prime (1220355525449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305088881359 + ... + 305088881362.

Almost surely, 2^{1220355525442} is an apocalyptic number.

1220355525442 is a deficient number, since it is larger than the sum of its proper divisors (610177762724).

1220355525442 is an equidigital number, since it uses as much as digits as its factorization.

1220355525442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610177762723.

The product of its (nonzero) digits is 480000, while the sum is 40.

The spelling of 1220355525442 in words is "one trillion, two hundred twenty billion, three hundred fifty-five million, five hundred twenty-five thousand, four hundred forty-two".