1240085566 has 4 divisors (see below), whose sum is σ = 1860128352. Its totient is φ = 620042782.

The previous prime is 1240085563. The next prime is 1240085569. The reversal of 1240085566 is 6655800421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6655800421 = 23 ⋅289382627.

It is an interprime number because it is at equal distance from previous prime (1240085563) and next prime (1240085569).

It is a super-2 number, since 2×1240085566² = 3075624422003080712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240085563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310021390 + ... + 310021393.

It is an arithmetic number, because the mean of its divisors is an integer number (465032088).

Almost surely, 2^1240085566 is an apocalyptic number.

1240085566 is a deficient number, since it is larger than the sum of its proper divisors (620042786).

1240085566 is an equidigital number, since it uses as much as digits as its factorization.

1240085566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620042785.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 1240085566 is about 35214.8486579170. The cubic root of 1240085566 is about 1074.3617819060.

Adding to 1240085566 its reverse (6655800421), we get a palindrome (7895885987).

The spelling of 1240085566 in words is "one billion, two hundred forty million, eighty-five thousand, five hundred sixty-six".