256497151320 has 96 divisors (see below), whose sum is σ = 835076333520. Its totient is φ = 68279397120.

The previous prime is 256497151307. The next prime is 256497151327. The reversal of 256497151320 is 23151794652.

256497151320 is a `hidden beast` number, since 2 + 5 + 6 + 49 + 71 + 513 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256497151327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 418339 + ... + 829458.

Almost surely, 2^256497151320 is an apocalyptic number.

256497151320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256497151320 is an abundant number, since it is smaller than the sum of its proper divisors (578579182200).

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

256497151320 is a wasteful number, since it uses less digits than its factorization.

256497151320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248385 (or 1248378 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 256497151320 in words is "two hundred fifty-six billion, four hundred ninety-seven million, one hundred fifty-one thousand, three hundred twenty".