1664442077 has 8 divisors (see below), whose sum is σ = 1730025696. Its totient is φ = 1599942672.

The previous prime is 1664442071. The next prime is 1664442089. The reversal of 1664442077 is 7702444661.

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

It is a cyclic number.

It is not a de Polignac number, because 1664442077 - 2¹⁶ = 1664376541 is a prime.

It is a super-3 number, since 3×1664442077³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664442071) 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 7 ways as a sum of consecutive naturals, for example, 267923 + ... + 274064.

It is an arithmetic number, because the mean of its divisors is an integer number (216253212).

Almost surely, 2^1664442077 is an apocalyptic number.

It is an amenable number.

1664442077 is a deficient number, since it is larger than the sum of its proper divisors (65583619).

1664442077 is an equidigital number, since it uses as much as digits as its factorization.

1664442077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542107.

The product of its (nonzero) digits is 225792, while the sum is 41.

The square root of 1664442077 is about 40797.5744009371. The cubic root of 1664442077 is about 1185.1033580851.

The spelling of 1664442077 in words is "one billion, six hundred sixty-four million, four hundred forty-two thousand, seventy-seven".