1247060666 has 4 divisors (see below), whose sum is σ = 1870591002. Its totient is φ = 623530332.

The previous prime is 1247060663. The next prime is 1247060669. The reversal of 1247060666 is 6660607421.

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

It is an interprime number because it is at equal distance from previous prime (1247060663) and next prime (1247060669).

It can be written as a sum of positive squares in only one way, i.e., 701137441 + 545923225 = 26479^2 + 23365^2 .

It is not an unprimeable number, because it can be changed into a prime (1247060663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311765165 + ... + 311765168.

Almost surely, 2^1247060666 is an apocalyptic number.

1247060666 is a deficient number, since it is larger than the sum of its proper divisors (623530336).

1247060666 is an equidigital number, since it uses as much as digits as its factorization.

1247060666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623530335.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 1247060666 is about 35313.7461337650. The cubic root of 1247060666 is about 1076.3723352472.

The spelling of 1247060666 in words is "one billion, two hundred forty-seven million, sixty thousand, six hundred sixty-six".