1240166563 has 4 divisors (see below), whose sum is σ = 1280171968. Its totient is φ = 1200161160.

The previous prime is 1240166561. The next prime is 1240166567. The reversal of 1240166563 is 3656610421.

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

It is a cyclic number.

It is not a de Polignac number, because 1240166563 - 2¹ = 1240166561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240166561) 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, 20002656 + ... + 20002717.

It is an arithmetic number, because the mean of its divisors is an integer number (320042992).

Almost surely, 2^1240166563 is an apocalyptic number.

1240166563 is a deficient number, since it is larger than the sum of its proper divisors (40005405).

1240166563 is an equidigital number, since it uses as much as digits as its factorization.

1240166563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40005404.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1240166563 is about 35215.9986795774. The cubic root of 1240166563 is about 1074.3851722776.

Adding to 1240166563 its reverse (3656610421), we get a palindrome (4896776984).

The spelling of 1240166563 in words is "one billion, two hundred forty million, one hundred sixty-six thousand, five hundred sixty-three".