257801066 has 16 divisors (see below), whose sum is σ = 405442368. Its totient is φ = 122707200.

The previous prime is 257801051. The next prime is 257801077. The reversal of 257801066 is 660108752.

It is a super-2 number, since 2×257801066² = 132922779261472712, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575 + ... + 22986.

It is an arithmetic number, because the mean of its divisors is an integer number (25340148).

Almost surely, 2^257801066 is an apocalyptic number.

257801066 is a deficient number, since it is larger than the sum of its proper divisors (147641302).

257801066 is a wasteful number, since it uses less digits than its factorization.

257801066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26797.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 257801066 is about 16056.1846651065. The cubic root of 257801066 is about 636.4460121228.

The spelling of 257801066 in words is "two hundred fifty-seven million, eight hundred one thousand, sixty-six".