1664007798 has 32 divisors (see below), whose sum is σ = 3388619520. Its totient is φ = 544592160.

The previous prime is 1664007797. The next prime is 1664007799. The reversal of 1664007798 is 8977004661.

It is an interprime number because it is at equal distance from previous prime (1664007797) and next prime (1664007799).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664007797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339888 + ... + 344748.

It is an arithmetic number, because the mean of its divisors is an integer number (105894360).

Almost surely, 2^1664007798 is an apocalyptic number.

1664007798 is an abundant number, since it is smaller than the sum of its proper divisors (1724611722).

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

1664007798 is a wasteful number, since it uses less digits than its factorization.

1664007798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5892.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 1664007798 is about 40792.2516907317. The cubic root of 1664007798 is about 1185.0002784453. Note that the first 3 decimals are identical.

The spelling of 1664007798 in words is "one billion, six hundred sixty-four million, seven thousand, seven hundred ninety-eight".