1664656011415 has 16 divisors (see below), whose sum is σ = 2113289856000. Its totient is φ = 1255294145952.

The previous prime is 1664656011401. The next prime is 1664656011427. The reversal of 1664656011415 is 5141106564661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1664656011415 - 2³¹ = 1662508527767 is a prime.

It is a super-2 number, since 2×1664656011415² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 44007967 + ... + 44045776.

It is an arithmetic number, because the mean of its divisors is an integer number (132080616000).

Almost surely, 2^{1664656011415} is an apocalyptic number.

1664656011415 is a deficient number, since it is larger than the sum of its proper divisors (448633844585).

1664656011415 is a wasteful number, since it uses less digits than its factorization.

1664656011415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88053966.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 1664656011415 in words is "one trillion, six hundred sixty-four billion, six hundred fifty-six million, eleven thousand, four hundred fifteen".