1011238666 has 4 divisors (see below), whose sum is σ = 1516858002. Its totient is φ = 505619332.

The previous prime is 1011238633. The next prime is 1011238673. The reversal of 1011238666 is 6668321101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6668321101 = 13 ⋅512947777.

It can be written as a sum of positive squares in only one way, i.e., 858197025 + 153041641 = 29295^2 + 12371^2 .

It is a super-2 number, since 2×1011238666² = 2045207279226919112, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 252809665 + ... + 252809668.

Almost surely, 2^1011238666 is an apocalyptic number.

1011238666 is a deficient number, since it is larger than the sum of its proper divisors (505619336).

1011238666 is an equidigital number, since it uses as much as digits as its factorization.

1011238666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505619335.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1011238666 is about 31799.9790251503. The cubic root of 1011238666 is about 1003.7322747948.

Adding to 1011238666 its reverse (6668321101), we get a palindrome (7679559767).

The spelling of 1011238666 in words is "one billion, eleven million, two hundred thirty-eight thousand, six hundred sixty-six".