1256164045420 has 48 divisors (see below), whose sum is σ = 2724569100288. Its totient is φ = 485983903680.

The previous prime is 1256164045417. The next prime is 1256164045427. The reversal of 1256164045420 is 245404616521.

It is not an unprimeable number, because it can be changed into a prime (1256164045427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537297 + ... + 1673623.

It is an arithmetic number, because the mean of its divisors is an integer number (56761856256).

Almost surely, 2^{1256164045420} is an apocalyptic number.

1256164045420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256164045420 is an abundant number, since it is smaller than the sum of its proper divisors (1468405054868).

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

1256164045420 is a wasteful number, since it uses less digits than its factorization.

1256164045420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138150 (or 1138148 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 1256164045420 in words is "one trillion, two hundred fifty-six billion, one hundred sixty-four million, forty-five thousand, four hundred twenty".