257166481 has 8 divisors (see below), whose sum is σ = 302125824. Its totient is φ = 215803920.

The previous prime is 257166467. The next prime is 257166487. The reversal of 257166481 is 184661752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257166481 - 2⁵ = 257166449 is a prime.

It is a super-2 number, since 2×257166481² = 132269197899846722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257166487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 899041 + ... + 899326.

It is an arithmetic number, because the mean of its divisors is an integer number (37765728).

Almost surely, 2^257166481 is an apocalyptic number.

It is an amenable number.

257166481 is a deficient number, since it is larger than the sum of its proper divisors (44959343).

257166481 is a wasteful number, since it uses less digits than its factorization.

257166481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798391.

The product of its digits is 80640, while the sum is 40.

The square root of 257166481 is about 16036.4111009914. The cubic root of 257166481 is about 635.9233727875.

The spelling of 257166481 in words is "two hundred fifty-seven million, one hundred sixty-six thousand, four hundred eighty-one".