257240066 has 4 divisors (see below), whose sum is σ = 385860102. Its totient is φ = 128620032.

The previous prime is 257240057. The next prime is 257240099. The reversal of 257240066 is 660042752.

257240066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 242456041 + 14784025 = 15571^2 + 3845^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64310015 + ... + 64310018.

Almost surely, 2^257240066 is an apocalyptic number.

257240066 is a deficient number, since it is larger than the sum of its proper divisors (128620036).

257240066 is a wasteful number, since it uses less digits than its factorization.

257240066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128620035.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 257240066 is about 16038.7052469955. The cubic root of 257240066 is about 635.9840208662.

The spelling of 257240066 in words is "two hundred fifty-seven million, two hundred forty thousand, sixty-six".