1664121296 has 40 divisors (see below), whose sum is σ = 3440029824. Its totient is φ = 777121280.

The previous prime is 1664121271. The next prime is 1664121311. The reversal of 1664121296 is 6921214661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12281 + ... + 58983.

Almost surely, 2^1664121296 is an apocalyptic number.

1664121296 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 1664121296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720014912).

1664121296 is an abundant number, since it is smaller than the sum of its proper divisors (1775908528).

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

1664121296 is a wasteful number, since it uses less digits than its factorization.

1664121296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46859 (or 46853 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 1664121296 is about 40793.6428380698. The cubic root of 1664121296 is about 1185.0272198463.

The spelling of 1664121296 in words is "one billion, six hundred sixty-four million, one hundred twenty-one thousand, two hundred ninety-six".