1220220109978 has 4 divisors (see below), whose sum is σ = 1830330164970. Its totient is φ = 610110054988.

The previous prime is 1220220109963. The next prime is 1220220109981. The reversal of 1220220109978 is 8799010220221.

It is a happy number.

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., 1062068341489 + 158151768489 = 1030567^2 + 397683^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305055027493 + ... + 305055027496.

Almost surely, 2^{1220220109978} is an apocalyptic number.

1220220109978 is a deficient number, since it is larger than the sum of its proper divisors (610110054992).

1220220109978 is an equidigital number, since it uses as much as digits as its factorization.

1220220109978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610110054991.

The product of its (nonzero) digits is 72576, while the sum is 43.

The spelling of 1220220109978 in words is "one trillion, two hundred twenty billion, two hundred twenty million, one hundred nine thousand, nine hundred seventy-eight".