1256432265 has 48 divisors (see below), whose sum is σ = 2431091520. Its totient is φ = 595002240.

The previous prime is 1256432251. The next prime is 1256432291. The reversal of 1256432265 is 5622346521.

1256432265 is a `hidden beast` number, since 1 + 2 + 5 + 643 + 2 + 2 + 6 + 5 = 666.

It is not a de Polignac number, because 1256432265 - 2¹³ = 1256424073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8230 + ... + 50799.

It is an arithmetic number, because the mean of its divisors is an integer number (50647740).

Almost surely, 2^1256432265 is an apocalyptic number.

1256432265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256432265 is a deficient number, since it is larger than the sum of its proper divisors (1174659255).

1256432265 is a wasteful number, since it uses less digits than its factorization.

1256432265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59094 (or 59091 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 1256432265 is about 35446.1883000133. The cubic root of 1256432265 is about 1079.0619040202.

Adding to 1256432265 its reverse (5622346521), we get a palindrome (6878778786).

The spelling of 1256432265 in words is "one billion, two hundred fifty-six million, four hundred thirty-two thousand, two hundred sixty-five".