1245566663 has 4 divisors (see below), whose sum is σ = 1358800008. Its totient is φ = 1132333320.

The previous prime is 1245566657. The next prime is 1245566669. The reversal of 1245566663 is 3666655421.

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 (1245566657) and next prime (1245566669).

It is a cyclic number.

It is not a de Polignac number, because 1245566663 - 2⁸ = 1245566407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245566669) 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, 56616656 + ... + 56616677.

It is an arithmetic number, because the mean of its divisors is an integer number (339700002).

Almost surely, 2^1245566663 is an apocalyptic number.

1245566663 is a deficient number, since it is larger than the sum of its proper divisors (113233345).

1245566663 is a wasteful number, since it uses less digits than its factorization.

1245566663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113233344.

The product of its digits is 777600, while the sum is 44.

The square root of 1245566663 is about 35292.5865161510. The cubic root of 1245566663 is about 1075.9423251310.

The spelling of 1245566663 in words is "one billion, two hundred forty-five million, five hundred sixty-six thousand, six hundred sixty-three".