1220471066 has 4 divisors (see below), whose sum is σ = 1830706602. Its totient is φ = 610235532.

The previous prime is 1220471059. The next prime is 1220471081. The reversal of 1220471066 is 6601740221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6601740221 = 6211 ⋅1062911.

It can be written as a sum of positive squares in only one way, i.e., 1163151025 + 57320041 = 34105^2 + 7571^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305117765 + ... + 305117768.

Almost surely, 2^1220471066 is an apocalyptic number.

1220471066 is a deficient number, since it is larger than the sum of its proper divisors (610235536).

1220471066 is an equidigital number, since it uses as much as digits as its factorization.

1220471066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610235535.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1220471066 is about 34935.2410325161. The cubic root of 1220471066 is about 1068.6672392351.

The spelling of 1220471066 in words is "one billion, two hundred twenty million, four hundred seventy-one thousand, sixty-six".