1664495616 has 208 divisors, whose sum is σ = 5219174144. Its totient is φ = 461832192.

The previous prime is 1664495549. The next prime is 1664495633. The reversal of 1664495616 is 6165944661.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 3182331 + ... + 3182853.

Almost surely, 2^1664495616 is an apocalyptic number.

1664495616 is a gapful number since it is divisible by the number (16) 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 1664495616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2609587072).

1664495616 is an abundant number, since it is smaller than the sum of its proper divisors (3554678528).

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

1664495616 is an equidigital number, since it uses as much as digits as its factorization.

1664495616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 572 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The square root of 1664495616 is about 40798.2305498658. The cubic root of 1664495616 is about 1185.1160647591.

The spelling of 1664495616 in words is "one billion, six hundred sixty-four million, four hundred ninety-five thousand, six hundred sixteen".