1220165011 has 4 divisors (see below), whose sum is σ = 1314023872. Its totient is φ = 1126306152.

The previous prime is 1220164963. The next prime is 1220165029. The reversal of 1220165011 is 1105610221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1105610221 = 877 ⋅1260673.

It is a cyclic number.

It is not a de Polignac number, because 1220165011 - 2²¹ = 1218067859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220165011.

It is not an unprimeable number, because it can be changed into a prime (1220165041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46929411 + ... + 46929436.

It is an arithmetic number, because the mean of its divisors is an integer number (328505968).

Almost surely, 2^1220165011 is an apocalyptic number.

1220165011 is a deficient number, since it is larger than the sum of its proper divisors (93858861).

1220165011 is an equidigital number, since it uses as much as digits as its factorization.

1220165011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93858860.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1220165011 is about 34930.8604388727. The cubic root of 1220165011 is about 1068.5779026108.

Adding to 1220165011 its reverse (1105610221), we get a palindrome (2325775232).

The spelling of 1220165011 in words is "one billion, two hundred twenty million, one hundred sixty-five thousand, eleven".