1664890141 has 4 divisors (see below), whose sum is σ = 1692183484. Its totient is φ = 1637596800.

The previous prime is 1664890127. The next prime is 1664890177. The reversal of 1664890141 is 1410984661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 754600900 + 910289241 = 27470^2 + 30171^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664890141 - 2¹⁵ = 1664857373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664890094 and 1664890103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664890441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13646580 + ... + 13646701.

It is an arithmetic number, because the mean of its divisors is an integer number (423045871).

Almost surely, 2^1664890141 is an apocalyptic number.

It is an amenable number.

1664890141 is a deficient number, since it is larger than the sum of its proper divisors (27293343).

1664890141 is an equidigital number, since it uses as much as digits as its factorization.

1664890141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27293342.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1664890141 is about 40803.0653382807. The cubic root of 1664890141 is about 1185.2096909153.

The spelling of 1664890141 in words is "one billion, six hundred sixty-four million, eight hundred ninety thousand, one hundred forty-one".