1664619552 has 96 divisors (see below), whose sum is σ = 4863116160. Its totient is φ = 553962240.

The previous prime is 1664619547. The next prime is 1664619587. The reversal of 1664619552 is 2559164661.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 1664619498 and 1664619507.

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, 709902 + ... + 712242.

It is an arithmetic number, because the mean of its divisors is an integer number (50657460).

Almost surely, 2^1664619552 is an apocalyptic number.

1664619552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664619552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2431558080).

1664619552 is an abundant number, since it is smaller than the sum of its proper divisors (3198496608).

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

1664619552 is a wasteful number, since it uses less digits than its factorization.

1664619552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183 (or 3169 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 1664619552 is about 40799.7494109952. The cubic root of 1664619552 is about 1185.1454780536.

The spelling of 1664619552 in words is "one billion, six hundred sixty-four million, six hundred nineteen thousand, five hundred fifty-two".