1256133330 has 48 divisors (see below), whose sum is σ = 3371307264. Its totient is φ = 324162720.

The previous prime is 1256133323. The next prime is 1256133341. The reversal of 1256133330 is 333316521.

It is a happy number.

1256133330 is a `hidden beast` number, since 12 + 5 + 613 + 3 + 3 + 30 = 666.

1256133330 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1256133294 and 1256133303.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 222324 + ... + 227903.

It is an arithmetic number, because the mean of its divisors is an integer number (70235568).

Almost surely, 2^1256133330 is an apocalyptic number.

1256133330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256133330 is an abundant number, since it is smaller than the sum of its proper divisors (2115173934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256133330 is a wasteful number, since it uses less digits than its factorization.

1256133330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450271 (or 450268 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 27.

The square root of 1256133330 is about 35441.9713052195. The cubic root of 1256133330 is about 1078.9763191025.

Adding to 1256133330 its reverse (333316521), we get a palindrome (1589449851).

The spelling of 1256133330 in words is "one billion, two hundred fifty-six million, one hundred thirty-three thousand, three hundred thirty".