256641662 has 4 divisors (see below), whose sum is σ = 384962496. Its totient is φ = 128320830.

The previous prime is 256641631. The next prime is 256641713. The reversal of 256641662 is 266146652.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64160414 + ... + 64160417.

It is an arithmetic number, because the mean of its divisors is an integer number (96240624).

Almost surely, 2^256641662 is an apocalyptic number.

256641662 is a deficient number, since it is larger than the sum of its proper divisors (128320834).

256641662 is a wasteful number, since it uses less digits than its factorization.

256641662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128320833.

The product of its digits is 103680, while the sum is 38.

The square root of 256641662 is about 16020.0393882162. The cubic root of 256641662 is about 635.4904859436.

The spelling of 256641662 in words is "two hundred fifty-six million, six hundred forty-one thousand, six hundred sixty-two".