256633225618 has 32 divisors (see below), whose sum is σ = 479970551808. Its totient is φ = 99980077200.

The previous prime is 256633225579. The next prime is 256633225657. The reversal of 256633225618 is 816522336652.

256633225618 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256633225579) and next prime (256633225657).

It is a super-2 number, since 2×256633225618² (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 15 ways as a sum of consecutive naturals, for example, 2573223 + ... + 2671093.

It is an arithmetic number, because the mean of its divisors is an integer number (14999079744).

Almost surely, 2^256633225618 is an apocalyptic number.

256633225618 is a deficient number, since it is larger than the sum of its proper divisors (223337326190).

256633225618 is a wasteful number, since it uses less digits than its factorization.

256633225618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114918.

The product of its digits is 3110400, while the sum is 49.

The spelling of 256633225618 in words is "two hundred fifty-six billion, six hundred thirty-three million, two hundred twenty-five thousand, six hundred eighteen".