256535465666 has 16 divisors (see below), whose sum is σ = 414475908000. Its totient is φ = 118690826688.

The previous prime is 256535465651. The next prime is 256535465713. The reversal of 256535465666 is 666564535652.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78497591 + ... + 78500858.

It is an arithmetic number, because the mean of its divisors is an integer number (25904744250).

Almost surely, 2^256535465666 is an apocalyptic number.

256535465666 is a deficient number, since it is larger than the sum of its proper divisors (157940442334).

256535465666 is a wasteful number, since it uses less digits than its factorization.

256535465666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156998513.

The product of its digits is 116640000, while the sum is 59.

The spelling of 256535465666 in words is "two hundred fifty-six billion, five hundred thirty-five million, four hundred sixty-five thousand, six hundred sixty-six".