1664056560 has 80 divisors (see below), whose sum is σ = 5462034336. Its totient is φ = 417644544.

The previous prime is 1664056549. The next prime is 1664056571. The reversal of 1664056560 is 656504661.

It is an interprime number because it is at equal distance from previous prime (1664056549) and next prime (1664056571).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199849 + ... + 208008.

Almost surely, 2^1664056560 is an apocalyptic number.

1664056560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664056560 is an abundant number, since it is smaller than the sum of its proper divisors (3797977776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664056560 is a wasteful number, since it uses less digits than its factorization.

1664056560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407890 (or 407884 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1664056560 is about 40792.8493733890. The cubic root of 1664056560 is about 1185.0118533949.

The spelling of 1664056560 in words is "one billion, six hundred sixty-four million, fifty-six thousand, five hundred sixty".