1664034596638 has 8 divisors (see below), whose sum is σ = 2496103180560. Its totient is φ = 832000203120.

The previous prime is 1664034596557. The next prime is 1664034596689. The reversal of 1664034596638 is 8366954304661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1664034596638² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8425578 + ... + 8620813.

It is an arithmetic number, because the mean of its divisors is an integer number (312012897570).

Almost surely, 2^{1664034596638} is an apocalyptic number.

1664034596638 is a deficient number, since it is larger than the sum of its proper divisors (832068583922).

1664034596638 is a wasteful number, since it uses less digits than its factorization.

1664034596638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17095202.

The product of its (nonzero) digits is 67184640, while the sum is 61.

The spelling of 1664034596638 in words is "one trillion, six hundred sixty-four billion, thirty-four million, five hundred ninety-six thousand, six hundred thirty-eight".