1664130186386 has 8 divisors (see below), whose sum is σ = 2543293303884. Its totient is φ = 816365751760.

The previous prime is 1664130186319. The next prime is 1664130186409. The reversal of 1664130186386 is 6836810314661.

It can be written as a sum of positive squares in 2 ways, for example, as 1347027178225 + 317103008161 = 1160615^2 + 563119^2 .

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

It is a super-3 number, since 3×1664130186386³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7849670585 + ... + 7849670796.

Almost surely, 2^{1664130186386} is an apocalyptic number.

1664130186386 is a deficient number, since it is larger than the sum of its proper divisors (879163117498).

1664130186386 is a wasteful number, since it uses less digits than its factorization.

1664130186386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15699341436.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 1664130186386 in words is "one trillion, six hundred sixty-four billion, one hundred thirty million, one hundred eighty-six thousand, three hundred eighty-six".