1664259741 has 48 divisors (see below), whose sum is σ = 2562792960. Its totient is φ = 1039184640.

The previous prime is 1664259733. The next prime is 1664259811. The reversal of 1664259741 is 1479524661.

1664259741 is a `hidden beast` number, since 16 + 6 + 4 + 2 + 597 + 41 = 666.

It is not a de Polignac number, because 1664259741 - 2³ = 1664259733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664259341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1077816 + ... + 1079358.

It is an arithmetic number, because the mean of its divisors is an integer number (53391520).

Almost surely, 2^1664259741 is an apocalyptic number.

It is an amenable number.

1664259741 is a deficient number, since it is larger than the sum of its proper divisors (898533219).

1664259741 is a wasteful number, since it uses less digits than its factorization.

1664259741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1703 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1664259741 is about 40795.3396970781. The cubic root of 1664259741 is about 1185.0600813419.

The spelling of 1664259741 in words is "one billion, six hundred sixty-four million, two hundred fifty-nine thousand, seven hundred forty-one".