1256564353 has 4 divisors (see below), whose sum is σ = 1370797488. Its totient is φ = 1142331220.

The previous prime is 1256564341. The next prime is 1256564383. The reversal of 1256564353 is 3534656521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3534656521 = 11 ⋅321332411.

It is a cyclic number.

It is not a de Polignac number, because 1256564353 - 2²⁹ = 719693441 is a prime.

It is a super-3 number, since 3×1256564353³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256564383) 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, 57116551 + ... + 57116572.

It is an arithmetic number, because the mean of its divisors is an integer number (342699372).

Almost surely, 2^1256564353 is an apocalyptic number.

It is an amenable number.

1256564353 is a deficient number, since it is larger than the sum of its proper divisors (114233135).

1256564353 is a wasteful number, since it uses less digits than its factorization.

1256564353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114233134.

The product of its digits is 324000, while the sum is 40.

The square root of 1256564353 is about 35448.0514697212. The cubic root of 1256564353 is about 1079.0997164139.

The spelling of 1256564353 in words is "one billion, two hundred fifty-six million, five hundred sixty-four thousand, three hundred fifty-three".