1657748668 has 12 divisors (see below), whose sum is σ = 2920273552. Its totient is φ = 823384800.

The previous prime is 1657748657. The next prime is 1657748671. The reversal of 1657748668 is 8668477561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371705 + ... + 1372912.

Almost surely, 2^1657748668 is an apocalyptic number.

It is an amenable number.

1657748668 is a deficient number, since it is larger than the sum of its proper divisors (1262524884).

1657748668 is a wasteful number, since it uses less digits than its factorization.

1657748668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744772 (or 2744770 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 58.

The square root of 1657748668 is about 40715.4598156523. The cubic root of 1657748668 is about 1183.5126271650.

The spelling of 1657748668 in words is "one billion, six hundred fifty-seven million, seven hundred forty-eight thousand, six hundred sixty-eight".