1256222563 has 4 divisors (see below), whose sum is σ = 1322339560. Its totient is φ = 1190105568.

The previous prime is 1256222501. The next prime is 1256222587. The reversal of 1256222563 is 3652226521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3652226521 = 967 ⋅3776863.

It is a cyclic number.

It is not a de Polignac number, because 1256222563 - 2¹⁷ = 1256091491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256252563) 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, 33058470 + ... + 33058507.

It is an arithmetic number, because the mean of its divisors is an integer number (330584890).

Almost surely, 2^1256222563 is an apocalyptic number.

1256222563 is a deficient number, since it is larger than the sum of its proper divisors (66116997).

1256222563 is an equidigital number, since it uses as much as digits as its factorization.

1256222563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66116996.

The product of its digits is 43200, while the sum is 34.

The square root of 1256222563 is about 35443.2301434280. The cubic root of 1256222563 is about 1079.0018678804.

The spelling of 1256222563 in words is "one billion, two hundred fifty-six million, two hundred twenty-two thousand, five hundred sixty-three".