256066348520 has 16 divisors (see below), whose sum is σ = 576149284260. Its totient is φ = 102426539392.

The previous prime is 256066348513. The next prime is 256066348537. The reversal of 256066348520 is 25843660652.

It can be written as a sum of positive squares in 2 ways, for example, as 246903647236 + 9162701284 = 496894^2 + 95722^2 .

It is a super-2 number, since 2×256066348520² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3200829317 + ... + 3200829396.

Almost surely, 2^256066348520 is an apocalyptic number.

256066348520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256066348520 is an abundant number, since it is smaller than the sum of its proper divisors (320082935740).

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

256066348520 is a wasteful number, since it uses less digits than its factorization.

256066348520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6401658724 (or 6401658720 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 256066348520 in words is "two hundred fifty-six billion, sixty-six million, three hundred forty-eight thousand, five hundred twenty".