1664745041 has 8 divisors (see below), whose sum is σ = 1686837480. Its totient is φ = 1642781952.

The previous prime is 1664745013. The next prime is 1664745053. The reversal of 1664745041 is 1405474661.

It can be written as a sum of positive squares in 4 ways, for example, as 607129600 + 1057615441 = 24640^2 + 32521^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664745041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1664744986 and 1664745004.

It is not an unprimeable number, because it can be changed into a prime (1664745001) 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, 6290 + ... + 58043.

It is an arithmetic number, because the mean of its divisors is an integer number (210854685).

Almost surely, 2^1664745041 is an apocalyptic number.

It is an amenable number.

1664745041 is a deficient number, since it is larger than the sum of its proper divisors (22092439).

1664745041 is a wasteful number, since it uses less digits than its factorization.

1664745041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64675.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 1664745041 is about 40801.2872468504. The cubic root of 1664745041 is about 1185.1752584287.

The spelling of 1664745041 in words is "one billion, six hundred sixty-four million, seven hundred forty-five thousand, forty-one".