1648900257 has 4 divisors (see below), whose sum is σ = 2198533680. Its totient is φ = 1099266836.

The previous prime is 1648900177. The next prime is 1648900271. The reversal of 1648900257 is 7520098461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1648900257 - 2¹⁹ = 1648375969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1648900277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274816707 + ... + 274816712.

It is an arithmetic number, because the mean of its divisors is an integer number (549633420).

Almost surely, 2^1648900257 is an apocalyptic number.

It is an amenable number.

1648900257 is a deficient number, since it is larger than the sum of its proper divisors (549633423).

1648900257 is an equidigital number, since it uses as much as digits as its factorization.

1648900257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549633422.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1648900257 is about 40606.6528662484. The cubic root of 1648900257 is about 1181.4031610814.

The spelling of 1648900257 in words is "one billion, six hundred forty-eight million, nine hundred thousand, two hundred fifty-seven".