1664085613 has 8 divisors (see below), whose sum is σ = 1779081408. Its totient is φ = 1550990784.

The previous prime is 1664085587. The next prime is 1664085649. The reversal of 1664085613 is 3165804661.

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

It is not a de Polignac number, because 1664085613 - 2¹⁷ = 1663954541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664085413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473431 + ... + 476932.

It is an arithmetic number, because the mean of its divisors is an integer number (222385176).

Almost surely, 2^1664085613 is an apocalyptic number.

It is an amenable number.

1664085613 is a deficient number, since it is larger than the sum of its proper divisors (114995795).

1664085613 is a wasteful number, since it uses less digits than its factorization.

1664085613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950483.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1664085613 is about 40793.2054759123. The cubic root of 1664085613 is about 1185.0187497849.

The spelling of 1664085613 in words is "one billion, six hundred sixty-four million, eighty-five thousand, six hundred thirteen".