1220165742 has 16 divisors (see below), whose sum is σ = 2441964672. Its totient is φ = 406449720.

The previous prime is 1220165719. The next prime is 1220165747. The reversal of 1220165742 is 2475610221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220165747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58228 + ... + 76359.

It is an arithmetic number, because the mean of its divisors is an integer number (152622792).

Almost surely, 2^1220165742 is an apocalyptic number.

1220165742 is an abundant number, since it is smaller than the sum of its proper divisors (1221798930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220165742 is a wasteful number, since it uses less digits than its factorization.

1220165742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136103.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1220165742 is about 34930.8709023981. The cubic root of 1220165742 is about 1068.5781160055.

Adding to 1220165742 its reverse (2475610221), we get a palindrome (3695775963).

The spelling of 1220165742 in words is "one billion, two hundred twenty million, one hundred sixty-five thousand, seven hundred forty-two".