1664231641 has 16 divisors (see below), whose sum is σ = 1802658240. Its totient is φ = 1531483200.

The previous prime is 1664231599. The next prime is 1664231663. The reversal of 1664231641 is 1461324661.

It is a de Polignac number, because none of the positive numbers 2^k-1664231641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664231597 and 1664231606.

It is not an unprimeable number, because it can be changed into a prime (1664231441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93526 + ... + 109888.

It is an arithmetic number, because the mean of its divisors is an integer number (112666140).

Almost surely, 2^1664231641 is an apocalyptic number.

It is an amenable number.

1664231641 is a deficient number, since it is larger than the sum of its proper divisors (138426599).

1664231641 is a wasteful number, since it uses less digits than its factorization.

1664231641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16536.

The product of its digits is 20736, while the sum is 34.

The square root of 1664231641 is about 40794.9952935406. The cubic root of 1664231641 is about 1185.0534116347.

The spelling of 1664231641 in words is "one billion, six hundred sixty-four million, two hundred thirty-one thousand, six hundred forty-one".