256724697550 has 24 divisors (see below), whose sum is σ = 477548504136. Its totient is φ = 102681155040.

The previous prime is 256724697547. The next prime is 256724697571. The reversal of 256724697550 is 55796427652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393304 + ... + 817396.

It is an arithmetic number, because the mean of its divisors is an integer number (19897854339).

Almost surely, 2^256724697550 is an apocalyptic number.

256724697550 is a deficient number, since it is larger than the sum of its proper divisors (220823806586).

256724697550 is a wasteful number, since it uses less digits than its factorization.

256724697550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436212 (or 436207 counting only the distinct ones).

The product of its (nonzero) digits is 31752000, while the sum is 58.

The spelling of 256724697550 in words is "two hundred fifty-six billion, seven hundred twenty-four million, six hundred ninety-seven thousand, five hundred fifty".