1664013622 has 4 divisors (see below), whose sum is σ = 2496020436. Its totient is φ = 832006810.

The previous prime is 1664013587. The next prime is 1664013623. The reversal of 1664013622 is 2263104661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2263104661 = 47 ⋅48151163.

It is a super-4 number, since 4×1664013622⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664013623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416003404 + ... + 416003407.

It is an arithmetic number, because the mean of its divisors is an integer number (624005109).

Almost surely, 2^1664013622 is an apocalyptic number.

1664013622 is a deficient number, since it is larger than the sum of its proper divisors (832006814).

1664013622 is an equidigital number, since it uses as much as digits as its factorization.

1664013622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832006813.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 1664013622 is about 40792.3230767751. The cubic root of 1664013622 is about 1185.0016609376.

The spelling of 1664013622 in words is "one billion, six hundred sixty-four million, thirteen thousand, six hundred twenty-two".